The Allow Payable Type Override check box on the AP Company Parameters form, PayTypes/Discounts/ICR tab.

Select this check box to allow overrides to the Pay Type when posting transactions (AP Transaction Entry, AP Recurring Invoices, AP Unapproved Invoices, and SL to AP Update). If you are using pay categories (above), selecting this check box also enables the pay category input on these forms.

Leave this check box unselected if you do not want the default Pay Type overridden when posting transactions (AP Transaction Entry, AP Recurring Invoices, AP Unapproved Invoices, and SL to AP Update). Additionally, if you are using pay categories, leaving this check box unselected disables the pay category input on these forms.