SAP Message U6166 - There are already entries for backlog set &1 in the error extract table

Diagnosis Entries already exist for the backlog set &v1& in the Error ExtractTable. A statistical backlog set is generated by evaluating a massrun. For this reason, this programm can only be started once per backlogset. Procedure Select a statistical backlog set, for which no entries already exist inthe error extract table.