Dates in WBS element & not current

What causes this issue?

WBS element &V1& is assigned to activities in a network. This network
has since been rescheduled.
In certain cases this could mean that dates for the WBS element have
changed as well.
The system will set the status "rescheduling required" for the WBS
element.

How to fix this error?

Check the status for the WBS element. If necessary, reschedule the
project or the WBS element.

Error message extract from SAP system. Copyright SAP SE.