Can I add GST category "Out of Scope" to Deposit options in Banking transactions when applying it to Payroll Clearing. Only options presently are re sales or purchases.

I inadvertently paid Gross amount instead of Net amount wages to an employee. He has returned the difference and I am trying to send the resulting deposit back to Payroll Clearing account. However in GST box, it only allows me to enter "Out of Scope (Sales)" or "Out of Scope (Purchases)" when it is neither, it should just be "out of scope". Is there a way to add this to options in the dropdown list? Not sure what to do...