Hi Arnab
The way I would achieve this is two-fold
1st Step
Create Data Partition in Service Desk via Admin Tab against the 'Call_Req' Table using the 'Defaults' Constraint Type, the constraint would be "status='OP'" (This will be your default constraint for all Requests/Incidents/Problems)
2nd Step
Make a copy of your NXROOT\CA\Service Desk Manager\bopcfg\www\htmpl\web\analyst\detail_in.htmpl
and paste it to NXROOT\CA\Service Desk Manager\site\mods\www\htmpl\web\analyst\
Edit your NXROOT\CA\Service Desk Manager\site\mods\www\htmpl\web\analyst\detail_in.htmpl file and find the following line
<PDM_MACRO name=dtlDropdown hdr="Status" attr=status factory=crs_in>
Replace this line so it looks like the below
<PDM_IF "$args.id" == "0">
<PDM_MACRO name=dtlReadonly hdr="Status" attr=status>
<PDM_ELSE>
<PDM_MACRO name=dtlDropdown hdr="Status" attr=status factory=crs_in>
</PDM_IF>
Hope this helps
Jacques