Error creating follow on documents for Shopping cart

Hi expert

we are on srm 701

and we are  using classic scenario

We are currently facing an issue with  follow-on documents are not created in R/3

i  Define Objects in Backend System (Purch. Reqs, Reservations, Purch. Orders)

when my manger approve Sc i havent any follow on doc in my back-end and i have this error in RZ20 :Shopping cart 0010000376: Error creating the follow-on document

but when is  using FM : BBP_PD_SC_TRANSFER the reservation created (for which material that define on  Objects in Backend System (Purch. Reqs, Reservations, Purch. Orders as created reserve)

but i cant create PO or PR

Please help to resolve this issue.