The School District return is a bit different than a normal city return as it doesn't have a line for withholding. Make sure in the PA Information Worksheet Part 1 a School Code is entered. If it's not then you can double click on the School Code lines to open a worksheet to pick your code. This would then generate the Philadelphia SIT form.
Most PA City Returns themselves go on the Local PA Tax return. You may need to look up to see if the local taxing agency supports this Generic form and if that is what the withholding is for.
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