Encountered Error PO-2055554... no mappings for the mapping sets... How to resolve this

Summary

I am processing a manual purchase order with PIM Item in the line. There are no defaulted account on the PO Charge Account. When I save the draft PO, the error messages displayed. How to resolve this.

Content

 

Errors encountered:  The account for account type PO Charge Account could not be determined because there are no mappings for the mapping set Purchasing Expense Account - Item  The account for account type PO Charge Account could not be determined because there are no mappings for the mapping set Expense Account - Organization.  The account for account type PO Accrual Account could not be determined because there are no mappings for the mapping set Accrual Account - Organization.