WBS elements have earlier start date than project definition

Message type: E = Error

Message class: CJ - Project master data and structure

Message number: 587

Message text: WBS elements have earlier start date than project definition



What causes this issue?

You entered a start date for the WBS element that is before the start
date in the project definition. Since the start and finish dates in the
project definition are not binding, processing has not been stopped.

Error message extract from SAP system. Copyright SAP SE.