Hello, I have encountered this error on FarApp. Fulfillment error: ERROR: INVALID_KEY_OR_REF - Invalid shipmethod reference key 5240 for subsidiary 4. Has anyone encountered same issue?

I believe shipmethod is referring to the Shipping Items at Lists>Accounting>Shipping items. The one with internal ID 5240 is not set up to be used on sub #4. You might have to set up a new one that is usable on sub 4 because I don't think shipping items can exist on multiple subs.