The following article will show how to get UoM to populate on the State Taxing Report.
Step By Step Guide
When you run the State Tax Reporting Tool under Sales->Sales Reports->Sales Excise Tax Tool, you have the option to select one of several UoM to have it report in the report. To do so you will want to Select it on the Display Units slicer under Item Parameters to the left as this screenshot shows:
Please note that as the screenshot indicates, choose only one UoM.
If you select multiple, you UoMs, the report won't know how to report that and thus sets the value to 0.00: