BAPI_PR_CREATE

hi

i cant create follow on doc in ecc

after i run test the BAPI_PR_CREATE i have this error

T ID                   NUM MESSAGE

E W5                   005 Please enter items first

E MEPO                 081 Creation indicator  invalid

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

whatss these?