Hi Lucy,
Please follow the enclosed link for Drill Through testing.
Target URL http://XXXXXXXXXX:portnumber/sap/bw/bex?&query=Query technical id
Under Query String I have defined time format as below
&VAR_VALUE_EXT_1 TIME ID
Please make sure that format of Time in BEX and BPC are same.To Acheive this, create property in required dimensions which should have same property as BW Field format.
Regards,
Naresh