required people or person field and drop down and date and time field in nintex task form

In nintex task form,I need mandatory field base Decision,

If approve selected, drop-down must be required, date picker and people picker is disabled.

if reject selected, date picker and people picker must be required, drop-down is disabled.

i cant find correct value for drop-down date picker and people picker to mandatory.

these function

isNullOrEmpty(field) or filed == "" or equal (field,"")

are not working well, both of situation(empty or not empty) form validated.

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These are working for me:

and(Decision==2,isNullOrEmpty({Self}))

but its not working form me!

can you screenshot your rules configuration?

Thank you Cassy, my problem solved, I did not use {self} from box, i just type {Self} and it could not connected and did not working well.

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