Unmatched transaction lines on Exact Online

I am looking for the unmatched transaction lines.

I found the MatchSetLines table, but I cannot find the match with the TransactionLines.
How can I match the TransactionLines with the MatchSetLines?

Endgoal is to find the TransactionLines which are not unmatched. See also the attachment:

Where is this screen located in the menu navigation?

When looking for unpaid invoices, I would use AROutstandingItems and/or APOutstandingItems and then optionally associate these on journal and number with TransactionLines.

I think you are looking for that

20 = Open (unmatched)
50 = Processed (matched)