Hi Shanti
There should not be any issue for a single instance system. Credit Management will sit natively integrated with other applications with in the same box. However, if you are looking for a mixed system landscape with essentially centralized credit management in one box, than you essentially need to use UKM_TRANSFER_ITEMS to build an interface. There is a AR Orchestration integration with S/4 HANA and SAP ERP Enviornments to central finance scenario. You should reach out to your SAP Account manager since the same is still a pilot release and not available in general. Your account manager should help you out. However, I believe the same uses PI/PO as a middleware and not SLT, so you need to check out licensing issues on that. The required configuration steps are:
1. Business Partner replication
2. Credit Area and Exposure configuration
3. If you need external interfaces, than configuration updates from external sources
4. Transfer of old credit management to FSCM Credit Management if you are already using classic credit management.
5. Setting interfaces to other systems. Most of the credit management work on XML output to target systems from the central system using Proxy based interface.
You can check out the configuration guide on SAP help to get an idea on how the distributed Credit management in FSCM works.
SAP Credit Management (FIN-FSCM-CR) - SAP Credit Management Configuration Guide - SAP Library
Regards
Sanil Bhandari