hello.
my 2 cents.. the URL should be the same as Incidents, Requests and Problems share the same table....
this is what I use.. for both Incidents and Requests...
http://<servicedesk server>/CAisd/pdmweb.exe?OP=SEARCH+FACTORY=cr+SKIPLIST=1+QBE.EQ.ref_num=".$trefnum;
best regards,
ken