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3) Check if the document is not already matched in other Reconciliation document. For this, go to Bank Reconciliation blue link in the header of Bank document:
4) If you posted Bank Reconciliation once, the matched documents will not appear in other Reconciliation documents even if you unpost and delete previous Reconciliation. If you face with such situation you need to repost Bank documents for the related period.
In Bank Payments and Bank Receipts List :
1) In filters Select The bank account for which you face the issue
2) Select Month of March in Period filter
3) Select all documents by pressing CTRL+A
4) Press More Actions - Post