Posted on behalf of Daniel Parra
When trying to add a default tax rate code to an expense type on an expense template there are not tax rate codes available in the list of values. The tax rate codes are created, active and they exist in the Tax lookup for Expenses (ZX_WEB_EXP_TAX_CLASSIFICATIONS).
Check that the start date of your expense template is not prior to the start date of your tax configuration (Regime, Tax and Tax rate codes). If the expense template has an effective start date prior to the start date of your tax configuration, the tax rate codes will not be available on the default tax rate code field for the expense type. Also remember that tax rate codes for expenses must be Inclusive handling. Even your tax is configured as Standard non inclusive handling you can override that parameter at tax rate level.