We cannot apply field access to the type Null

[osinquinvdm]

I need to set a date for some type of data.

Namely when [Nature]="Information", the "End Date" is null and I need to replace that null value by whatever date is in the “Start Date” column.

#"Filtered Rows" = Table.SelectRows(#"Added Delay", each [Nature] <> null and [Nature] <> ""),
#"Fixed empty date" = Table.TransformColumns(#"Filtered Rows",{"End Date", each if [Nature]="Information" then [Start Date] else [End Date] })

Unfortunately I’m getting the following error, even though I made sure Nature is never null nor empty

Expression.Error: We cannot apply field access to the type Null.

Details:

    Value=

    Key=Nature

Any idea what’s going on?

Thanks

[MarcelBeug · Accepted solution]

With Table.TransformColumns, it is not possible to reference other columns.

Instead, you can add a column with the fixed empty date, then delete the original End Date and rename the new column to End Date (and optionally move it to the original location of End Date).