How to write business rule to set Assignement Group and to clear Assigne to On update of Incident?

[KM SN]

I want to set assignment group to 'x' and assigned to to empty when 

1) incident state is changes from resolved to any other except closed.

2) No change of current incident assignment group ( when no change in assignment group while update)

3) when assigned to is abel tuter only

I tried this scenario but not working on PDI, can I expect some inputs?? @Ankur Bawiskar

[KM SN]

@Bharath Kumar A Can i expect a answer for above question ?

[Bharath Kumar A]

When you are applying any business rules for updating the form, you have to use before business rule, which does not any impact on form updates. In your case you have to apply conditions and based on that you have update form. so before business suits for your requirement