Attribute customization - scrip based valiation

I have created a script based validation and have assigned it to a attribute in edit attribute window and also have mentioned dependency. However whenever I save the WI , the validation is not getting executed . Is that I am missing some configuration ?

I have referred this and performed every step mentioned there except the one adding in process configuration source as I am not sure in which of it I should add
https://jazz.net/wiki/bin/view/Main/AttributeCustomization#Script_Based_Validation