Matching what the books record against what the bank says.
A difference cannot be forced through
To close a reconciliation, the balance you have matched must equal the statement's closing balance exactly. A difference of one unit refuses the close.
There is no "accept the difference" option, and that is deliberate: a reconciliation that tolerates a gap has not reconciled anything.
When the numbers do not meet, something is unrecorded or recorded twice — and that is precisely what it is telling you.
Take the opening and closing balances from the statement
Each reconciliation is defined by the bank statement's opening and closing balances. Those figures must come from the statement itself, not from the books — otherwise you are comparing the books against themselves.
For now, only the payments side
What is reconciled here is payments made against supplier bills. Money received against sales invoices lives in its own ledger and cannot yet be matched from this page.
That is a known limit, not a fault.