Ishani/Cristi,
Are you trying to really display the "id" of the srel field in question here? Or another attribute of that srel field.
Example: chg.ztest --> SREL -> ztest.id
and ztest table has, name, description, etc., etc.,
So, if you really want to display the id itself, then PdmString would help.
But if you are looking to display an extended attribute like, ztest.name, then you need to create an attribute alias like the one being discussed here:
Hope this helps
_R