We are receiving the specified error when attempting to post expense reports with certain expense types.
The long text states: "The posting includes tax items which are not or only partly deductable. In these cases the tax codes have to be determined via BAdI implementation"
One expense type that is returning the error is Posting and Shipping Charges (POST) which has been configured with the settings seen in the attachment
I believe the error is occurring because the Rate Type Code of the Expense item in the IDoc is set as 1-3, preventing a tax code from being derived.
Does the suggested BAdi have to be implemented to derive the tax code, or is there another way to resolve this issue.