I would like help with the proper python script to field calculate a fields value from two separate fields plus a sequential number when there is more than 1 record with the same facility number. Basically build a expression where the fields rpsuid + facilityNumber + sequential number if more than two records with the same facility number. The field waterUtilityNodeIDPK I populated manually to show what I would like the result to look like. Please notice the record number with the facility number named Comm where there is only one record. In the IDPK field the value is 6705Comm with no sequential number since there is only one.