SAP Message WU048 - Items are assigned to module & -> you cannot delete

Diagnosis
You tried to delete a module to which items are assigned. If items areassigned to a module, you cannot delete the module.
If subsequent processing has not yet taken place, item assignments canbe deleted. If the first step in subsequent processing has been savedyou can no longer delete the assignments.

Procedure
First use the module maintenance function to delete the items in themodule and then delete the module itself.