What does ‘Class Nbr is a required field’ mean?

The error message Class Nbr is a required field means that one or more rows have an empty Class Nbr field – i.e. it means you clicked the plus sign button too many times.

Error message: Class Number is a required field. You must specify a Class Number or delete the row to close this page.

Click the minus sign and delete the row(s) with the empty Class Nbr field.

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