I am trying to save an item journal line in a Work order for a product with 0 cost. I am getting the following message:

We have previously been able to post lines for this same item for 0 cost, and I do not believe any item config has changed. This has only just started happening within the past week. We did recently take an update, however, we took the same update in a Test environment and could not reproduce the message there. Looking for some help/guidance on what could be driving this change.
Thanks,