Cannot Close Request With Non-Mandat Field action on the item

Cannot Close Request With Non-Mandat Field action on the item

Hi dears
I use Non mandate field rule to create request and set this rule on my Item, but when i want to close this request announce that item have to be filled to close.
when i select my some subcategory in the form they dont have any item and i should disable and non mandate item field but when i want to close request item is the mandatory filed.
how i can solve this?

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