Illinois Schedule CR - Credit for taxes paid to other sttes

As an IL resident who works in St. Louis, MO, the IL CR schedule allows a credit to be taken for taxes paid to MO which includes both state taxes & St. Louis City taxes. TurboTax does not bring forward the St. Louis City tax into this Schedule as it should. The St. Louis taxes were entered from W-2. Why doesn't this work & how does one fix it to get the full credit allowed.