Since the bank account is linked to the GL, you can configure the "Allow Negative Posting" setting within the General Ledger Setup. Make sure the option to allow negative posting is disabled, which will prevent transactions that would create a negative balance from being posted in the general ledger. However, if you want to post both debits and credits but don't want the overall balance to go negative, this functionality isn't available in standard Business Central. In this case, I would recommend creating a quick Power Automate flow to address the requirement.
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