Distribute Amount for service items

HI, i have this error when trying to “distribute amount” in PO (The Accounting distribution form is not available because there are no amounts to distribute)

  • The PO is confirm

  • The Product type of item is Service

  • Item model group configure for a service and it is OK

  • Item Group also is OK

also i cannot make correct in account distribution view it is locked.

Any Idea Please?