AR invoice batch - Post In progress

SOLVED

Sorry if this has been discussed (and answered) a lot, but I can't seem to find a decent search function for the forum.

Trying to post an AR invoice batch but it's stuck in Post In Progress. When I run data integrity, it says no errors. When I try to post, it gives me this error:

Description: An invoice detail optional field was found with no corresponding invoice detail

Any ideas on how to fix?

Thanks.