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To unmatch a bank settlement:
In Accounting Center, in the left navigation pane, click Transactions > Cash > Cash Matching.
You see the Cash Matching workspace. The Manual Matching tab is active by default.Select the Matched & Suspended tab.
Search for the bank settlements that you want to unmatch.
Select the check box for each bank settlement you want to unmatch.
On the Cash Matching tab, in the Actions group, click Unmatch.
The system unmatches the selected bank settlements. You no longer see them in the Matched/Suspense Records tab. The bank settlements have an unmatched status and are eligible for matching.