R12 Payment priority other than 99

Dear Community,

When simply creating a Supplier of Employee Supplier type, the payment priority (in the Invoice Management tab)  defaults to 99. We want it to default it to 1. When we manually create a Supplier of type 'Employee Supplier' this default option is ignored completely and the payment priority defaults back to 99

Can you please advise how to get the payment priority default to a value other than 99?

thank you!

Alex