Accounting of outside operations in WO

Hi

We are using std outside operations for mfg work orders in A9.1. The generated outside PO qty is received and work is completed. During the accounting of work order, have noticed that GL F0911 entries for OV transactions are not balanced. Understand that whenever we receive outside PO, it will create OV entries for PO receipt qty and IM entries for the corresponding qty in F4111 to balance out the inventory value . However when we run WO accounting P31802, noticed that F0911 have only one entry for OV (debit entries) and no credit entries.

Are we missing any setup?. . Appreciate if  you could share/advise how does manufacturing accounting program P31802 make entries in F0911 for outside process PO.