Hi Jagesh,
As per your workflow design, condition step must be completed before triggering of USER DECISION step. If this is not the case, then there is some fault in your logic.
Also, please let us know what exactly your TEMP step is doing in the workflow design.
As per your image, it seems you want to send an email to the user as soon as he/she receives a workitem in his/her SAP Inbox. So, for this, instead of using work item exits, you can simply go with Extended Notifications or scheduling of standard report RSWUWFML2(not supported by SAP now).
Richa