Every month I download a set of data into a report. That data consists of multiple records and each record has a record specific date as well as having the month end report date on the record's data-row. I have used Power Query to upload all of these month end reports. I want use Power Query to be able to compare the column of record dates with the earliest date in the column of report dates to see if anybody has fiddled any data entry. The query table has the following headings.
Record ID Record Date Report Date
I've tried adding a custom column using the formula = if Record Date < List.Min(Report Date) then "Old" else "New"
this didn't work and I've spent ages trying to get a solution. I've also tried using Groups to get the minimum value, but I lose all of the other columns, which I want to keep. Any help really appreciated.