SAP Message 62920 - The "Valid-to" date must be same as or after "Valid-from" date

Diagnosis You have entered a valid-to date specifying the end of the ownerassignment. This date is before the valid-from date. System Response The system does not accept your entry. Procedure Specify a valid-to date that is equal to or after the valid-from date.If the assignment end date has not been specified, leave the valid-todate empty.