I’ve created a workflow action that updates the location on the item sublist of an order when its created. We also have a custom transaction line field that sources a custom record value from the item associated with the line. Whenever I enable the workflow, I get an error like

Invalid custcol_ov_line_vas reference key 1.

on creating the order where 1 is a valid id for for one of the items in the custom record list. It works fine if I don’t manipulate the item sublist in any way with my custom workflow action. Any ideas on what I should be doing differently?