I wonder how I can make a routine control of information within a field

I wonder how I can make a routine control of information within a field

I wonder how I can make a routine control of information within a field?

For example, before changing the status of a potential for gain, I would check that the closing date is less doque today's date.

Or, see if another field in my form potential is nonzero.

I await contact
Pugas

NOTE: Text translated by google translate