User tries to Edit a Non-G/L change in a posting transaction (e.g. Invoice or Bill) in a closed period but receives the error: "The G/L impact of a transaction in a closed period cannot be changed."
This may happen when a user changed the Accounting Preference of Allow Per-Line Departments from T to F.
To resolve this:
- Navigate to Setup > Accounting > Accounting Preferences
- Set Allow Per-Line Departments = T
- Click Save