New field (Reassignment Reason) is visible/mandatory when assigned to is updated

[ahmed-24]

i want to create a new field (Reassignement reason) which is (Visibile/mandatory) when the assigned to is updated 

Icreate a UI Policy whith script; i also create a client script. But it's not working!!

Help please. 

[ahmed-24]

@VedS Thanks for your reply but the sollution dosn't work! it blocks the assigned to field 

[VedS]

Hello @ahmed-24 ,
Could you please set the mandatory as leave alone and visibility to false and check.

Also Could you please adjust the Client script like this.