Hi - Please see these 2 screens, the purchase order page is for our customer orders, you will see the dro[p dpown of a choice (invoice or from hardware) - i have built thre sytem so that at the moment when an order is placed it will show to invoice, but we hold customer credit which we call 'hardware' so if thst box is checked i need it to draw against the hardware balance on the customer page with the highlighed background.  if the checkbox is to invocie i dont wnat the bvalue to be deducted from the harwdare balance, as we will egenerate an invoice for the customer to  pay?  thanks