&1 &2: Start date (&3) conflicts with finish date (&3)

What causes this issue?

The finish date (&V3&) of the project element is before its start date (
&V3&).

System Response

The system may calculate the dates incorrectly if you are using
constraint dates.

How to fix this error?

Correct the start date (&V3&) or finish date (&V3&).

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.