Do you want an attribute that has tab characters so when you export from Excel the attribute elements drop into different columns (like a hierarchy)?
If all you need is to insert spaces or other whitespace into the attribute form display, then I would create a new attribute form with an ApplySimple statement.
Classify this form as a description form and display it in your report instead of the ID form. This way, the database engine will group by and filter on the ID ([class_number]) and get the padded version (LPAD([class_number],4,'0') in the last pass of the report SQL. You suffer no performance degradation.
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