Diagnosis
You specified level &V1& of the material hierarchy for the query inCustomizing for data retraction, but level &V2& in the selection (viaselection screen or from the item data).
You can only use the level of the material hierarchy (and thus onlynodes from this level) that is specified for execution of the hierarchyin Customizing.

System Response
This message is also displayed (with selection level "0") if you do notspecify the material hierarchy at all, either explicitly through theselection criteria or implicitly through the item values (also seeEnhancements for Allocation Table Types).