From my experienced, when there is transaction show "Not Posted" in the Reconciliation Status. I just click on that and choose "Delete" and post the bank recon. If it still remain, I will do the second time posting with the same bank recon date. It will removed after posting.

Mostly for transaction that carried forward from many months back, if above method cannot work then will need to call the service provider to fix it.

This error is something like an image duplicate info hanging in bank recon database. It won't effect the details in GL.