Set line numbering in contract from SoCo

Dear Experts,

we are creating contracts in SAP ECC from SRM sourcing cockpit (as follow on documents of accepted bid, or directly from approved shopping cart).

For these contracts, we defined a new document type in ECC (say, TYPE2), copying the type already used for contracts created directly in ECC (say, TYPE1).

We noticed that in the TYPE2 contract line items are numbered 1, 2, 3…while in TYPE1 contract items are numbered 10, 20, 30…

Moreover, if new lines are addes in TYPE 2 contract directly in ECC, new lines are numbered 10, 20, 30.

We checked SRM customizing under Configurable Item Numbering, and defined rule assignment for business object BUS2000113 and transaction type PCTR, but nothing changed.

Do you have any suggestion on how to achieve line numbering 10,20,30…?

Thanks a lot,

Cinzia