SAP Message 6P513 - Requirement existed in deleted state, and was chenged

System Response
The system saves all planned independent requirements that are enteredunder a requirements number that is maintained internally within thesystem. This requirements number is not deleted if you delete theplanned independent requirement. That is, if a planned independentrequirement item of a particular material is deleted, this requirementsnumber still remains in the system. New planned independent requirementsor changed independent requirements that are entered for this materialare continued to be saved under this number.