Dump DYNPRO_SEND_IN_BACKGROUND when calling FM 'POPUP_GET_VALUES' from BEx

Dear all,

I am facing an issue which is only occuring, when ABAP is been called from BEx Analyzer.

During a planning function of type Exit, an ABAP is called in which the function module 'POPUP_GET_VALUES is been called.

When I debug it in BW, everything works fine. When running the planning function in BEx, system connection is been quit with the following message: "Screen output without connection to user."

The short dump in ST22 has the title DYNPRO_SEND_IN_BACKGROUND.

Looking foward to get help by any of you experts.

Thanks in advance!