The AP choices for terms do not include PROX which is common.

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  • does this help? in AP > Setup > Terms Mainteance

    Day of the Month (Days Before Due)

    Select this check box if the terms require payment on a specific day of the month. If this check box is selected, the number entered in the Days Before Due field is used as the day of the month. For example, if 10 is entered in the Days Before Due field, and this check box is selected, the payment is due on the 10th of the month.

    Clear this check box if the terms do not require payment on a specific day of the month. If this check box is cleared, the number entered in the Days Before Due field is added to the invoice date to determine the due date. For example, if 10 is entered in the Days Before Due field, the invoice is dated on the 7th of the month, and this check box is cleared, then the payment is due on the 17th of the month.

    This check box is available only if a number greater than zero is entered in the Days Before Due field.