Missing posting on Bank rec

If you double-click on the item on the matter ledger and check the double-entry bank nominals, it may be the incorrect client bank was picked up in the original posting.
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If this is the case then a simple Journal between your client banks will rectify.
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Another option is to post a CCR (Client Receipt) to the client bank picked up on the original posting in error, followed by posting a CDR (Client Payment) to the correct client bank.