Errors in Custom Planningfunctions not recognized in AO

Hi there,

I have a scenario where we call a custom planning function form AO using following VBA statement:

lResult = Application.Run("SAPExecutePlanningFunction", "CheckData")

The function "CheckData" is a custom planning function doing some checks on the data.

When there is an error we raise an error message like this:

The error message also comes up in AO.

Now the problem: The IResult does not reflect the error (value 1).

Do we have to set anything additonal in the planning function?

Thanks

Oliver