GTS: External Number range Business Partner (FTO, LU, Customers, Vendors)

Hi Folks,

We have a customer requirement, where in, Customers Numbers and Vendors Numbers transferred from Feeder System (ECC6.0) Should be same in GTS. However i noticed that in GTS, we have to create these as Business Partners. I couldn't able to find how to create these in separate number range, as GTS permits to create business partners in same number range.

Also for creating the Foreign trade organisation and Legal unit, i have to use the same Business partner number range with external assignement.

For example, If i assign a number range from 0000000001 to 9999999999 as external assignement, then SAP throws a message while creating Business partners as " No Standard grouping exists" and system expecting a number range with marked as internal Standard grouping

Please advice how to create the Customers, Vendors, Foreign trade organisation and Legal Units with external number range.

Regards,

Pradeep Maddi