Error Received When Moving Candidate to HR as a Result of Nullify "Grade" AutoComplete Rule

Summary:

We have a pending use case for an AutoComplete rule, which is intended to nullify the "grade" value on Worker Assignment when a job is changed and no valid "grades" exist. The field modification AC rule works as expected on Change Jobs, Transfer, etc. However, when we attempt to move a Candidate to HR via My Client Groups, Recruiting, Job Requisitions, we are receiving a 'JBO-29000' error. We have default valid grades and enforce valid grades enabled.

Content (required):

Navigation used to "Move to HR": My Client Groups, Recruiting, Job Requisitions, Click on Applications Link, Select a Candidate, Create Offer, Extend Offer, Accept Offer, Move to HR.