... and I'm back.
The issue arises due to the Priority Order Handling order-total's use of a checkbox-type field to gather the customer input.
When OPC processes a credit-class selection via click of an Apply button, OPC's confirmation page is activated to cause any posted inputs to be recorded in the customer's session. After that recording, the OPC's main data-gathering page is re-displayed ... which causes that checkbox selection to be lost.
You can see similar behavior in the 3-page checkout process. If you tick the Priority Order Handling checkbox and navigate to the checkout-confirmation page and then return to the checkout-payment page (like if the customer decided that they wanted to include some comments in the order) ... the checkbox selection is lost.
That order-total module requires an update to be usable under current versions of PHP anyway, so I propose the following actions:
- Update the Priority Order Handling plugin to use a radio-button type input for its selection as well as the above update.
- Update the OPC's documentation to indicate that order-total modules using a checkbox-type field for their input are not compatible with OPC.



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