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As you all know ECC and CRM system are different in many ways , Web UI , Middleware, Pricing engine, Authorization and the list goes on … another difference which is not usually not much discussed is the post client copy processes to make the system work again . The main reason for this is Middleware . A standalone CRM  may be same as an ECC system but when CRM is linked to ECC and middleware comes into picture things start getting more complicated.

I have listed some of the most important and general tasks which should be done after the client copy.

No Tasks T-code System Comments
1 Change OLTP LOGSYS from PRD to QAS BDLS CRM
2 Change CRM LOGSYS from PRD to QAS BDLS CRM
3 Change OLTP LOGSYS  from PRD to QAS BDLS ECC
4 Activating Status Reporting SMWP CRM
5 Generating Filter Modules in Client Copies GNRWP CRM
6 Checking Table CRMCONSUM (SAP ERP) SM30 and SE16N ECC
7 Maintaining Table CRMRFCPAR (SAP ERP) SM30 and SE16N ECC
8 Maintaining Table CRMPAROLTP (SAP ERP) SM30 and SE16N ECC
9 Activating Event Control (SAP ERP) SM30 and SE16N ECC
10 Get the RFC user and RFc destination for CRM and ECC system SM59 , SU01 ECC,CRM
11 Test the RFC connectivity with ECC using the RFC user and check the Authorizations

SM59,SU01

ECC,CRM
12 Change Site for OLTP SMOEAC CRM
13 Creating Subscriptions for OLTP SMOEAC CRM Not required all the times
14 Setting for Trusted Systems (SMT1) SMT1 ECC
15 Correct RFC destination R3AC4 CRM For delta download activation
16 Check ECC  table, Table TBE31 ECC
17 Define Profiles for ERP Sales Transactions –> Change/correct RFC destinations CRM
RFC destination setup
SPRO->CRM->Transactions->Setting for Service Transactions->Integration->Set up Time Sheet and  Controlling Integration
18 Maintain Logical System Mapping for Transaction Launcher (BD97) BD97 CRM
19 Define URL and Parameters for ITS on Target ECC System (CRMS_IC_CROSS_SYS) CRMS_IC_CROSS_SYS CRM

These are generic steps there can be additional steps like availability check or Time sheet integration etc ..

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