Common SAP C4C Architecture Cases in Enterprise Implementations
SAP C4C is becoming one of the top-ranking CRM solutions for enterprises having an SAP landscape, as it is not an isolated product. SAP C4C integrates closely with SAP ERP, SAP S/4HANA, SAP CPI, and other external applications to provide sales, service, and marketing teams with a 360-degree view of the customer in real time. Due to the interconnectedness of the system, understanding SAP C4C Architecture is one of the most searched and most challenging topics for consultants, architects, and businesses that are doing a CRM transformation.
If you look for "SAP C4C Architecture PDF" in the hope of finding one downloadable document, you are justified to do so as there is no singular document. There is no 'one' SAP C4C architecture. It morphs and changes based on the scope of integration, business complexity, and the history of application deployment. This document explains SAP C4C architecture in detail and explains the most frequently adopted enterprise architecture so that organizations can determine the most relevant architecture to their business.
What is SAP C4C Architecture?
SAP C4C architecture represents the foundation of the technologies that support the SAP Cloud for Customer, including the internal communication of the various modules and the interfaces to both SAP systems, SAP ECC, SAP S/4HANA, SAP CPI (Cloud Platform Integration), and other non-SAP systems including Salesforce and other legacy systems either on the cloud or on-premise.
At its core, SAP C4C architecture extends its multi-tenancy, cloud-native structure into its own data centers. For customers, the physical infrastructure is fully managed by SAP. However, customers need to understand the interaction between the application, integration, and extensibility layers, as their understanding impacts performance, customization, and the total cost of ownership.
The architecture includes four primary layers:
- Presentation Layer – This includes the Fiori-based UI and SAP C4C mobile app.
- Application Layer – This includes core business logic for Sales Cloud, Service Cloud, and Marketing modules.
- Integration Layer – This includes SAP CPI and other middleware components and C4C interfaces to ERP, S/4HANA, and other third-party applications.
- Data Layer – This is the multi-tenant cloud database of SAP managed with tenant-level isolation.
Knowing these four layers is critical to understanding each architectural scenario that follows.
Why SAP C4C Architecture Varies Across Enterprises
SAP C4C architectures are intentionally all different, with three main areas affecting the architecture:
- Backend ERP landscape – This impacts integration design and is dependent on whether organizations use SAP ECC, S/4HANA on-premise, or S/4HANA Cloud.
- Integration strategy – This is dependent on whether organizations use SAP CPI as middleware, direct point-to-point, or predominantly a hybrid model.
- Business process scope – This determines the breadth of architecture and is dependent on whether organizations use C4C for service ticketing or support full quote-to-cash across Sales Cloud and ERP.
This explains why a search for "SAP C4C architecture pdf" often doesn't meet users' needs. Determining which architecture to use depends on the scenario in which an organization finds itself. Most organizations fall into one of the scenarios listed below.
Typical SAP C4C Architecture Scenarios
Scenario 1: SAP C4C Integrated with SAP ECC (Classic Landscape)
This remains the most common scenario among organizations that have not yet migrated to S/4HANA. In this scenario, SAP C4C is the front-office CRM, SAP ECC is the back-office system that runs order processing, billing, and finance.
Integration is done through SAP's Cloud Integration Content delivered out-of-the-box, and middleware such as SAP CPI or the older SAP PI/PO. Master data objects (accounts, contacts, products, and pricing) are replicated in both systems. Sales orders, for instance, are exchanged from C4C to ECC.
Architectural characteristics:
- Synchronization facilitated through middleware (older setups typically use batch integration)
- Predefined SAP Standard Integration templates for custom development
- Data replication is done in a batch mode for noncritical objects
This is the most ideal scenario for organizations that have not yet migrated to S/4HANA but want a more modern CRM system integrated with SAP ECC.
Scenario 2: SAP C4C Integrated with SAP S/4HANA (Modern Landscape)
This scenario is rapidly becoming the most popular among organizations migrating to S/4HANA. SAP CPI is the integration backbone, and customers use the prepackaged integration scenarios for S/4HANA-C4C.
The most significant architectural change of the ECC scenario is the ability to synchronize in real-time. With S/4HANA, the simplified data model and OData-based APIs result in faster and more granular data exchange and help achieve near real-time visibility of pricing, availability, and order status in C4C.
Main architectural features:
- Utilizes CPI for integration with standard iFlows
- Allows faster sync for Master and transactional data via OData services
- Enables side by side extensibility via SAP BTP (Business Technology Platform)
Businesses usually adopt this scenario as part of an overall digital transformation, beyond just a CRM upgrade.
Scenario 3: Hybrid Architecture with Multiple Backend Systems
It is common for large businesses, especially those that have expanded through mergers and acquisitions, to operate more than one backend system. For instance, SAP C4C may be integrated with SAP ECC in one region, S/4HANA in another, and even a non-SAP ERP for a specific business unit in other regions.
This scenario requires a more complex technical architecture. SAP CPI will be the main integration hub and will direct data in a smart way, depending on business unit, region, or product line. Custom integration flows will be built, along with the standard integration content, and will be coupled with a data harmonization effort, as the master data for different backend systems can differ.
Key architectural characteristics:
- Central Integration Hub Pattern utilizing SAP CPI or SAP BTP Integration Suite
- Custom mapping logic
- Increased governance around data quality and control of duplicates
When it comes to SAP C4C technical architecture patterns, this is among the most intricate, and this is where senior integration architects add the most value, as incorrect routing logic can lead to cross-region data corruption issues, which are almost impossible to diagnose.
Scenario 4: SAP C4C with Third-Party and Non-SAP Solutions
Not every company using SAP C4C has an SAP backend. There are companies that have C4C as a best-of-breed CRM and have Finance on Oracle, Marketing Automation on HubSpot, and E-commerce on a custom solution.
In this case, integration is largely using REST/SOAP APIs, SAP CPI with Non-SAP Adapters, or third-party integration tools (Dell Boomi, MuleSoft) as a connection. Without any SAP-to-SAP integration content, architects must rely on their custom data models and error handling logic.
Key architectural characteristics:
- API-centric integration design (REST/OData/SOAP)
- Custom Logic Middleware vs. packaged content
- Increased effort for validation and testing edge cases
This is a common business scenario for mid-market companies as well as some organizational units of large enterprises that incorporated SAP C4C independently of a complete SAP implementation.
Scenario 5: SAP C4C Combined with Extensibility via SAP BTP
The SAP BTP (Business Technology Platform) extensibility model has been designed as an individual architecture model. Enterprises focused on further customization, whilst avoiding disruption to standard SAP cloud upgrades, using BTP extensibility. Rather than incorporating in-app extensibility and thus modifying C4C's core, companies developed side-by-side extensions on SAP BTP, consuming C4C data through APIs and offering additional features, custom dashboards and other processes and features that are specific to their industry.
Key Architectural Characteristics:
- Clean-Core Principle: core C4C remains unchanged, extensions exist externally
- Custom applications are hosted on SAP BTP services (Cloud Foundry, Kyma)
- Custom applications are hosted on SAP BTP services (Cloud Foundry, Kyma)
To maintain the integrity of the core system and protect it from update conflicts while allowing considerable segmentation, SAP recommends this scenario the most.
SAP C4C Technical Architecture: Explanation of Core Components
No matter which scenario an enterprise falls under, there are specific technical elements that consistently apply to SAP C4C architecture. Familiarity with these components is useful when assessing vendor offerings, estimating the effort for integration, and identifying performance-related issues.
| Component | Function | Common Tools/Technology |
|---|---|---|
| Integration Middleware | Manages flows of orchestration between C4C and other systems | SAP CPI, SAP PI/PO |
| Communication Arrangements | Sets endpoints, authentication, and communication scenarios within C4C | SAP C4C Admin Cockpit |
| Extensibility Layer | Enables addition of fields, logic, and UI customization | Custom Business Objects, SAP BTP |
| Data Replication Framework | Controls the data sync for master and transactional data | Standard Integration Content, OData APIs |
| Analytics Layer | Supports C4C reporting and dashboards | SAP C4C Analytics, embedded reporting |
| Mobile Layer | Adds field sales and service functionality to C4C | SAP C4C Mobile App |
The architecture will not function reliably if these components are not appropriately configured. A common mistake in implementation is to perceive communication arrangements as a one-off, especially in a hybrid scenario with multiple backend systems, rather than something that requires governance.
Choosing the Correct SAP C4C Architecture for Your Enterprise
There is no definitive answer, but the following questions provide a useful framework:
- What is the ERP system in your backend, and do you plan to migrate within the next 2-3 years? If you plan a migration to S/4HANA, you would want to integrate using SAP CPI standard content early, to avoid building it twice.
- Across how many business units and/or regions do you need integration? If multiple backend systems are required, the hybrid architecture with centralized orchestration would likely be used.
- How much customization does the business need beyond standard CRM processes? Extensive customization needs create a demand for a BTP-centric extensibility approach to keep the core system protected from conflicts with upgrades.
- Does the organization already have a non-SAP middleware? When there is a presence of Boomi, MuleSoft, etc., it is considered a reasonable decision to build upon that already existing investment, rather than implementing SAP CPI simultaneously.
Companies that skip this step of the evaluation, procure and begin implementation of SAP before the evaluation of the architecture, and have to modify the architecture during the implementation creating delays and increasing the costs. The evaluation of the architecture prior to the go-live is the most essential and meaningful step of the SAP C4C implementations.
Most Frequent Errors in the Architectures of SAP C4C Implementations
Several of the mistakes mentioned below are inevitable, even when implementation teams have experience in SAP C4C implementation.
- Ignoring the governance of master data. This is especially the case where there are multiple back-end systems, and leads to the proliferation of duplicate accounts and contacts.
- SAP CPI is treated as a simple pipe. This causes problems when more and more interfaces are added to a system that was not designed to facilitate governance.
- Core System Customization. Rather than implementing SAP based side-by-side extensions.
- Error handling is ignored in integration flows. This leads to integration failures that are not discovered until discrepancies in reporting are identified.
- The architecture design is informal when the implementation is expanded to additional business units or geographical regions.
Most of these errors can be avoided by having the appropriate SAP C4C consulting expertise from the design phase, rather than at the point of the technical build.
Frequently Asked Questions
What is SAP C4C architecture?
SAP C4C architecture encompasses the layers that build the framework of SAP Cloud for Customer. This includes the presentation layer (Fiori UI), the application layer (Sales, Service, Marketing Cloud modules), the integration layer (SAP CPI, APIs), and the multitenant cloud data layer which SAP maintains.
Is there an Official SAP C4C architecture PDF available from SAP?
SAP has architecture reference documentation available in the SAP Help Portal and integration content library. However, there is no singular, universal PDF. Since architecture is determined by many factors including backend systems, integration design, and customization scope, it is advisable to become familiar with common scenarios and align your enterprise with the closest one.
What is the difference between SAP C4C integration with ECC versus S/4HANA?
Integration with ECC meant that SAP had to rely on data replication that was scheduled and run by the middleware. With S/4HANA, integration has been designed to achieve a faster and more granular sync using OData APIs and new SAP CPI integration content that is closer to real time data.
Does SAP C4C require SAP CPI for integration?
While SAP C4C integration is most commonly achieved using SAP's middleware, SAP Cloud Platform Integration (CPI), it is not a requirement. Using SAP PI/PO, Boomi, MuleSoft, or other engagement models that rely on direct API and point-to-point integrations are valid options based on the customers' existing infrastructure.
What is clean-core principle in SAP C4C architecture?
The clean-core principle aims to avoid customizing the standard SAP C4C system. Instead, custom functionality is built in side-by-side extensions hosted on SAP BTP. This principle allows cloud customers uninterrupted service during the cloud upgrade cycles.
Is it possible to use SAP C4C by itself without an SAP backend?
SAP C4C may function as a standalone CRM or work with any number of non-SAP products including those from Oracle, HubSpot, or custom solutions built with REST/SOAP and utilize third-party middleware. Thus, C4C can be used outside of a complete SAP ecosystem.
Final Thoughts
The SAP C4C architecture cannot be expressed as a static diagram that can be universally downloaded and applied. Rather, they are a series of patterns molded by the backend systems of an enterprise, the level of integration, and the degree of customization. Whether one is operating a traditional ECC integration, a contemporary S/4HANA integration, a hybrid multi-system integration, or a BTP integration with extensibility, the correct decision around architecture taken early in the integration process can greatly reduce the effort of that integration in the future.
For those enterprises considering SAP C4C or those going through a redesign of their enterprise architecture, the correct integration and extensibility strategies on Day 1 are what will keep the integration process from becoming highly costly in the future.
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