We finally figured it out-
The CALCAPPLYTO is a hidden dynamic field, with no way to unhide it, that resides in JOBTOOL, JOBMATERIAL, and JOBITEM(Job Plan Item tab, material tab, tool tab).<
It looks like someone did some sort of manipulation that told the database to assign an ‘X’ to any CALCAPPLYTO field that was blank(Some have HOURS, some have QUANTITY). The error was correct in saying you cannot have the ‘X’ because it’s not a valid value.
I was able to get into the database and wipe the ‘X’ from the applicable lines and just make them blank.