Status cannot be set for WBS element &

What causes this issue?

You are using a header-assigned network that is not assigned to the
selected WBS element.
Therefore the status cannot be set for the WBS element.

System Response

The status is not set for the WBS element.

How to fix this error?

Set the status seperately for the WBS elements and the network.

Error message extract from SAP system. Copyright SAP SE.