External number range for purchase order response?

Hi all,

is it possible to use an external number range when creating purchase order responses (BUS2209, PCO, POR) manually?

If I transfer the POR from an external system like SUS via XML, can I use an external number range?

I'm using SRM 4.0 (EBP 5.0) in standalone scenario with Business Connector 4.7 as XML interface.

Any help is appreciated,

Karsten