Why does Fishbowl say "Item has already been fulfilled."?

This purchase order line is already set to Fulfilled, so setting it to Fulfilled again does nothing and Fishbowl says so. If the line really is fulfilled, there's nothing to do. If it was marked fulfilled by mistake, changing a fulfilled line back is a restricted action that depends on your setup and order history; check with whoever administers your Fishbowl before forcing it.

Fishbowl: "Item already fulfilled" — cannot reapply status

What triggers it

You set a purchase order line to Fulfilled, but it is already in Fulfilled status. The action is redundant, so Fishbowl stops it.

Why Fishbowl blocks it

Fulfilled marks a line as complete for its purpose on the order. Re-applying the same status has no effect and would only muddy the order’s history, so Fishbowl reports that it’s already done rather than logging a meaningless change.

What to do

If the line is supposed to be fulfilled, dismiss the dialog; nothing is wrong. If it was fulfilled by mistake, reversing a fulfilled line depends on the order’s state and your permissions, and it isn’t always possible. Confirm the line’s current status on the PO, and if you need to undo it, check with your Fishbowl administrator rather than forcing the change.