SAP CRM 7.0 connected to Legacy system

Dears -
we have the requirement to connect our SAP CRM system (7.0) - that is a brand-new installation NOT to ECC, but to a legacy system.
We have planned to implement custom interfaces to replicate the masterdatas. Doubt is: can you point out which are the Best Practices / Building Blocks in order to perform the configuration in SAP CRM without being it connected to ECC.
Every reply is greatly appreciated.
Teresa

> Do you have a sort of best practifce with all the customizing steps need to be done by hand?
This depends on which scenarios you use and what you plan to do with the system. CRM is pretty complex and VERY big so there is no BP guide, especially not if there's no ERP ABAP backend. I'd start SPRO, use the standard IMG and start on top.
Markus

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