[solve] picklist - mandatory

[rslemer]

I think the alternative, add a blank value in list is the way vTiger solved this problem.

This option can be included, in future, when user, at layout editor, choose mandatory on picklist ( enhanced feature )

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I can do a mask in field with a business map too? and check if number is correct ( DG ) ?

How I can created a custom function? there any documentation or example?