There are two ways to make payments when they have been marked as complete in error.
In the case there are a few payments
If there are a small number of payments, it may be easiest to pay them manually.
Go to Lettings properties > Property balances
Select View BACS schedule from the left sidebar
Select All (complete) from the Category dropdown in the top left
You can now view the details of the payments marked as complete and proceed to make manual payments in your bank
In the case there are several payments
If there are several payments, you may want to create a new BACS schedule.
Follow the steps above to access the Completed items
Locate a payment line that was marked complete in error and select the red X in the Roll back column
Repeat this for each payment line
This will return the landlord's balance to a positive figure (as before the items were added to the BACS schedule).
Once all items are rolled back
Navigate to Lettings properties > Property balances and click Generate BACS Schedule again
Select View BACS Schedule and create a new payment file by selecting Generate BACS schedule from the top right corner
After paying, users should mark these as complete as normal