Defining Number range for different document type in SAP SRM

Hi Experts,

I am using SAP SRM 7.01. I need to create different number range for different document type which should reflect in creation of follow-on document.

While creation of follow-on document, there should be different number range for different document type. So I have defined the number range for follow on document in "Define Number Range for shopping cart and follow-on document".

Now I need to define the backend system for follow-on document in "Define Number range per backend system for follow-on document". Here I can define only PO number range for one logical system but I need to define more than one.

How should I go for it?

System throws error if I define same system more than once.

Help is appreciated.

Regards,

Ankita Bhagat