Change assignment page grade value is blank after the profile option PER_ENFORCE_VALID_GRADES is Y

Summary:

The grade value in change assignment page is nulling even though the PER_ENFORCE_VALID_GRADES is set to Y ,whereas the transfer page is showing the default grade value while updating a record.

Change Assignment:

Transfer Page:

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Code Snippet (add any code snippets that support your topic, if applicable):