Vendor Number range changes

Dear All,

we have requirment to change number range and account group for Vendor ,
This vendor we are using in CRM for contract booking.

We set up new number range and account group in ECC and vendor flown to CRM.

But when we process RO in CRM it is error ,not flown to R3.

Pl suggest what needs to be check in CRM when new vendor account group is created with new number range.

Thanks