Diagnosis
From within an outbound task, you attempted to determine the attributeV2 from an aggregate group. however, the grouping currently set in theCustomizing does not support this parameter.

System Response
Since the value cannot be determined, the system cannot perform theprocess.

Procedure for System Administration
Check whether the relevant outbound task processing requires a specificgrouping. If this is the case, you should adjust the Customizingsettings appropriately.