
“CST Suffix for ICMS” is a mandatory field
In the Tax Codes - Setup window, you have defined a tax code, and you have chosen the Update button. However, the CST Suffix for ICMS field is empty.
The CST Suffix for ICMS field is mandatory when the tax type is linked with the ICMS tax category.
In the CST Suffix for ICMS field, specify the last 2 digits of the CST code.