Start date for WBS element & no longer fits

What causes this issue?

The start date which you entered for WBS element &V1& does not lie
within the time frame of the superior WBS element any more.
There will be scheduling conflicts if you continue with time scheduling.

System Response

INCLUDE 'NA_ALLG_VERARBEITUNG' OBJECT DOKU ID TX

How to fix this error?

Use the menu option <LS> Edit</> to check and reconcile the dates.

Error message extract from SAP system. Copyright SAP SE.