Subdate Formula not working?

Subdate Formula not working?

Hi all

I have tried every possible way of getting this ti work in the formula field but it keep telling me I dont have enough arguments. I have opted to use a formula field in the form instead of a function as it is a very simple calculation

Subdate (Newdate (${Product Information.Rental End Date}),60,'MONTH')

The Field I am using is the rental end date of a contract and I am trying to calulate the strat date 60 months prior.

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