Solved
WHY IS AN INVOICE SHOW AS PAID WHEN ITS NOT?
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Hi info923,
Please check that you have the setting to automatically apply credits disabled by going to the Cog Wheel > Account and Settings > Advanced > Automation > Un-tick 'automatically apply credits'. This will prevent any existing credits on a customer or supplier account attaching to the payment.
For the invoice which is paid, open this and select the '1 payment made' link showing to open the invoice payment. You can then delete this by going to More > Delete on the toolbar.
Thank you