Sage can successfully post a journal containing perfectly valid entries that still do not represent what the business intended.
Technical Validity and Financial Meaning Are Different
An account can exist. A period can be open. Debits can equal credits. The batch can update. And the activity can still be coded to the wrong place.
Reporting Is Often Where the Problem Becomes Visible
A strange financial statement, unexpected trial-balance movement, or odd detail report may be the first sign that the transaction went somewhere nobody expected.
Follow the Source
We like to trace the journal back to the module, document, account mapping, distribution, or entry process that created it.
That is how you fix the system instead of correcting the same symptom every month.