Hi John,
If I understand this correct, smag_6 is a field from usp_owned_resource Table which is SECONDARY to ca_owned_resource.
Use the below code in your respective HTMPL file for nr (Configuration Items) table and add the line
<PDM_MACRO name=dtlReadonly hdr="<XXXX>" attr="smag_6">
The above will fetch you the data for the object in readonly format
Note: If there is no data for this field then you will empty value.