When you select the Amount Paid at Sale link, Sage 50 displays the Receive Money window, where you can quickly enter a single customer payment. This feature is typically used to enter a receipt for the sale at the time the sales invoice is posted. For example, your customer can apply a payment at the time of the sale and have it indicated on the invoice.
Note: You can only enter one payment for the invoice using this method. All other payments must be entered and applied by going to Tasks> Receive Money .