Function 'WORKDAY' returning #INVALID COLUMN VALUE when formula in different column

Hi, I seem to be having difficulty with something that should be so simple. I have two columns 'Date Required' and 'Decision Date'. 'Date Required' is a user input date field, 'Decision Required' is (or should be), an auto-calculated field to subtract 5 working days from the 'Date Required' field. The formula I have currently is:-

=WORKDAY([Date Required]1, -5)

I am receiving the error:- #INVALID COLUMN VALUE

If I place the formula in the same column as 'Date required' it works fine, but not in other columns. Surely I am not limited to the same column, can anyone advise please?

Many thanks, James.

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Even

I had a similar issue. Your note about it working in certain columns made me check the data format in the column I was trying to use. Turns out Column Properties was set to Text/Number. Changing the column where the formula is used to Date format fixed the issue for me.

James H

Thanks Even, I checked the Date Required column was ok, but not the Decision date, which was set set to Text/Number, so all fixed now.