Passing parameters values from webdynpro to SAP GUI

Dear Experts

iam trying to pass values from webdynpro application to SAP GUI Transaction

here is the sample code which iam using

CONCATENATE 'http://s0164dep01.adta.uae:50000/irj/portal/interop?NavigationTarget=pcd:portal_content/Testing/trn_iw33?'

'%20CAUFVD-AUFNR='

'ApplicationParameter=CAUFVD-AUFNR='

lv_workorder';'

'DYNP_OKCODE=SHOW'

INTO lv_url.

i could'nt able to succed as its displaying page not found exception.

Help me on this to proceed further

Regards

Jaipal.E