In Dynamics CRM 2013 having control on Business Process fields seems to be impossible. You cannot apply Business Rules on these fields but yet it’s possible to access them via Javascript. I think this can be very useful since it’s very simple to implement. You only have to prefix your field names in the code by header_process_ and let the script execute onLoad and onSave.

For example:

• Getting field’s control when it’s on the form : Xrm.Page.getControl(“fieldname”);
• Getting field’s control when it’s on the business process: Xrm.Page.getControl(“header_process_fieldname”);

In the business process suppose you want to update the text field field2 when the value of the boolean field1 is Yes:

function iSaidYes()

{

//Check the control on the form

if (Xrm.Page.getControl(“header_process_field1”) != null && Xrm.Page.getControl(“header_process_field2”) != null ) {

if(Xrm.Page.getControl(“header_process_field1”).getAttribute().getValue()==1)

{

Xrm.Page.getControl(“header_process_field2”).getAttribute().setValue(“I said Yes”);

}

else

{
Xrm.Page.getControl(“header_process_field2”).getAttribute().setValue(“I said No”);

}

}

}