Making Customized Fields Numeric and Meeting Conditions

[ISO Retail]

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Is there anyway of making the customized field numeric only and having certain conditions. I specially ask for people to enter the purchase order number which is 5 digits and over 15000. These idiots (sorry) are entering all kinds of letters and numbers and 3 digits and the forms taking.

[Klemen]

Something like this would require a lot of editing and modifying. This is out of the scope of my support, sorry.