Control Table

I am seeking assistance in creating a formula with the formula wizard that will make this certain criteria true:

If the product starts with an R, then this field is mandatory. 

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    Update: I created this condition on the control table:

    left$(num$([M:WE6SCA1]ITMREF), 1) = num$(R)

    It seems to NOT be working correctly. The fields that I apply the control table to is making everything mandatory and not sorting based on if the product is being with an R