How I can get rid of a 1 cent debtor balance from a matter? I can't close the matter

When trying to close a matter with a nominal debtor balance (or any balance). 

Step-by-step guide

Process a debtor journal as follows: 

• Menubar > Transactions > Debtor Journal Input - For example, if it relates to matter 2801 / invoice BI0000128 (say there's 1 cent in Fees outstanding) you enter the journal as follows:
  
  Matter: 2801
  Transaction Type: Write-on Fees
  Reference No: BI0000128 (this is the invoice number you are raising the debtor journal against).
  Narrative: Write off...
  Amount: -$0.01
  
  
• Leave the remaining 3 fields blank 
• Click 'Add Transaction' at bottom left of display 
• Click OK to process the journa