Through Change Template ---> Form and field rules I have made certain fields disabled on canvas of Change request template , so that the requestor is not able to fill these at Submission stage . The rule has been put in Create / Edit mode 

These fields are now disabled in Create mode , but am finding that the fields are still EDITABLE in attached screen of requestor (file attached) 

One option was not to provide the EDIT option to this role , but it not possible , as the requestor has to assign the persons in certain roles (like ' ChangeApprover ' and ' LineManager') , which are available only in EDIT Mode  

(If we can bring these roles in the form template itself , while form creation , then too my problem can be resolved)  

regards

Sandeep