Diagnosis
The name of the Cube, from which an export-InfoSource is to begenerated
, is longer than 29 characters.

System Response
The name of the export-InfoSource is formed from the name of the
source-InfoCubes, by placing an '8' before it. The length of an
InfoSource name is limited to 30 characters: Therefore, no
export-Infosources can be generated from InfoCubes whose name is longer
than 29 characters.

Procedure
Shorten the name of your InfoCube.