Why Supplier Portal "Requires Acknowledgement" is not linked to the change order?

Summary:

Content (please ensure you mask any confidential information):

When the buyer has created a change order for a supplier, and supplier to acknowledge the change order. In the Supplier Portal end, the infolet "Requires Attention" has it own section "Orders to Acknowledge". If the order to acknowledge is the original document, the "circle" takes the Supplier Portal user directly to the order, and it can be acknowledged easily.

In the case, the order to acknowledge, is change order, the link from the infolet takes the Supplier Portal user to the original document, and when they aim to acknowledge it, the system gives error "You do not need to acknowledge this document because it is not pending acknowledgement. No further actions needed. (PO-2055036)", because the link was to the original document, and not to the change order which is supposed to be acknowledged.