Hi Maju.
On the modality emulator, or in the real modality, you have to configure the MWL server (your dcm4chee) and the query that the modality is going to do against the MWL server. Normally it will query by the modality type and the study date. Other advanced configurations could include the scheduled station name or scheduled station aetitle, but for these two fields you have to customize some other things.
Best regards.