SRM PR,PO is not getting created in ECC backend

HI

i create SC in classic scenario. and after the manager approve the SC the follow on Doc didnt create in ECC

i define object for po pr and reserve in backend

when i check FM :BBP_PD_SC_CHECK i havent any error message

but when i have chek the SC in RZ20 i have this error: Local Error: Shopping cart 0010000308: Error creating the follow-on document

and when i chek BBP_PD i have this status:

Stats:

           Status         Description                    Inactiv

HEADER     I1015          Awaiting Approval              X

HEADER     I1021          Created

HEADER     I1038          Complete

HEADER     I1106          Shopping cart ordered

HEADER     I1129          Approved

how to resolve this issue?

Regards

Elham