Dear Sabyasachi ,
I think we need to consider integration aspect as well here , if you are creating new client respective
changes in integration and client assignment needs to be carried out so that ECC Points to correct EWM system.
ECC ---> EWM , One to one relation between ECC and EWM .
At any point you need to setup client and logical system appropriately to have respective integration flow.
ECC - EWM1 ( Client Copy of EWM )
ECC1 copy of ECC - EWM1 (Client Copy of EWM )
In both cases integration needs to be setup appropriately. Please try same and revert incase of any querys.
Thanks
Jinoy