No items relevant for staging of materials exist in order &1

What causes this issue?

Order &V1& does not contain any WM-relevant items for material staging.

System Response

The system first checks whether the production storage location in the
component is filled and assigned to a <GL:warehouse_number>warehouse
number</> in which the PP-WM interface is active. Afterwards, it
checks to make sure that the selected components have been released.

How to fix this error?

Check in order &V1& whether the above requirements have been met.

Error message extract from SAP system. Copyright SAP SE.