Expense POs are Generating Accounting for Receiving Inspection event

Problem Statement: Expense POs are Generating Accounting for Receiving Inspection event in Review Receipt Accounting Distributions under Receipt Accounting

The Error states that the account used in PO Distribution is invalid. You must review the error: Only **** Cost Center with the Balance Sheet Accounts.

Need guidance in understanding on the below pointers:

1. Why are Expense POs generating receiving inspection event entries
2. Where is the accounting defaulted from