SAP Note 22060 - Drill-down reporting: KH408/KH125 during XXL export

Symptom:

Drill-down reporting: Error message KH408 or KH125 when you try to export a report to XXL.

Cause and prerequisites

Possible cause: the report in question has too many columns (e.g. the overview list (drill-down list in 3.0) has too many columns). The Excel List Viewer can only display 256 columns and 16384 lines.

Solution
Change the definition of the overview list so that it generates fewer columns. In 2.2: in the report definition screens, change the values for "Columns for the overview list" and "Lines for the overview list." In 3.0, change the definition of the drill-down list in the layout set.
The exact formula for data transferred by the application:
26 + # of data columns + 5 * ( 1 + # of characteristics ) < 256.