BAPI_CONTRACT_CREATE error ("SD document is not in database ...")

Hi.

I need to create a contract of MM and I use the BAPI_CONTRACT_CREATE.

In the end, the table of return have this three lines:

1 E BAPI 001 No instance of object type PurchasingContract has been created. External reference: # 1

2 E V1 302 SD document is not in the database or has been archived

3 E V1 302 SD document is not in the database or has been archived

Please, help me.