Diagnosis
You accessed the pull list using a selection type which reexplodes thebill of materials of the selected orders. In this case, you cannotstage picking parts.
WM stages picking parts on an order basis and updates the materialstaging information in the dependent requirements of order. As, due tothe re-explosion of the BOM, the system determines dependentrequirements dynamically instead of reading them from the database,this information is not available. The necessary update of the staginginformation can also not be carried out when staging picking parts.

Procedure
Select a selection type for WM material staging where the dependentrequirements are read from the database.