Need Expert advice on choosing Source System for creating/maint Customers.

Hi Experts,
Iam on project where we have CRM,ECC(SD),FICA in the System Landscape.The client is currently using ECC(SD) Customer master for creating/maintainig Customer's.As we have CRM & FICA in this implementation, we are planning to propose that we use CRM as the source system for creating/maintaing Customers as Business Partners & Perform standard replication to the other system's in the landscape.
The client has has asked us to confirm if having CRM as the source is the Best practice in the industry when we have this three systems (CRM,FICA,ECC(SD)) Landscape.I thought to get some expert advice on this & see if any of you have a similar project experience & share some views on this CRM BP vs ECC(SD) Customer Master.
Thanks in advance!
Regards,
Naveen

Hi,
I believe it depends on your business senario.Here I can share some my experience for you.
CRM As Source System
Advantage:
1) Choosing CRM as source system ,you can create several roles of customer for tracking the presales process of customer，such as prospect ,sold to party ,customers ,also you can define the life cycle of your customer and control which life cycle of customer should be replicated to ECC and which one should not.
2) CRM can have more views of customer and customer defined field (EEWB fields) ,so if you choose CRM as Source it will be more convenient to create and fill in the all your user defined field .In other words ,choosing ECC as source you have to extend these field again in CRM .
3） easy to maintain customer relationship
Disadvantages：
1） Have to extend Company code view of Customer data, since CRM do not have these view ,it is just used for billing and integration with financial accounts.
2） have to extend some particular partner function of customer ,it is because of CRM it is only possible to create part of partner function automatically like SP ,BP when business partner is replicating to ECC.
ECC As the source
Oppositely， if you choose ECC as the source ,the advantage become disadvantage.
Advantage :
1) Can Easily to create customer's data of company code view
2) Can easily to assign any partner function to customer
To conclude， if you only need to create sales order in ECC ，I believe choosing ECC as Lead system is better, since you do not have to extend customer data and easily to integrate with FICO and SD.Howerver, if you are going to create a sales order from opportunity or quotation ,CRM is your best choice.
Regards ,Edward

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