Remove Duplicate values with a condition

[Martin Obongita]

Hi ALL,
I have the method below to remove duplicate rows in a listDo iSQLTableColNameRowList.$sort($ref.lOriginalColName,kFalse)
Do iSQLTableColNameRowList.$cols.lOriginalColName.$removeduplicates()
The problem is it deletes all duplicate rows.
How do I remove duplicate rows in a list with a condition, say, remove all duplicates but check that C7(the column flag in the list) is true?
 Kind regards