Hi Nuran,
You can try to retrieve the ROID associated to the request in two steps as follows:
1 - Query the Service Catalog Database (MDB) to find the object_info associated to your request_id, in the usm_object_wf_instance_ref table:
select object_info from usm_object_wf_instance_ref where object_id1 = <CatalogRequestID>
The first result is actually the PAM's ParentProcessROID, that is, the process that initiated the actual PAM process instance. In this case, it's the Start Request Form(SRF).
2 - Query the PAM Runtime database to find the ROID using the Parent Process ID found in step 1:
SELECT ROID
FROM [dbo].[C2ORuntimeObjects]
where ParentID = <ParentProcessROID>
and DocumentType = 'FlowChart' -- Object of type "Process"
Please, Let us know the results
Best Regards