How to prevent Billing return order line which has original sales order line not billed?

We have a Business concern that when we have a sales order line with below status:

Shipped Qty = 100 each

Billed Qty = 0 Each

at this stage we did not create any billing for the customer, But the ISSUE is when we return this sales order line, and by Mistake the user selected line type "Return for credit and return the item" which returns the qty and the credit as well,

Now in this case for this shipped and not yet billed lines, how to prevent create billing when by mistake user slected to "Return for credit and return the item"