Syntax issue Opendoc is passing prompt data to child report - BICS based 4.0 Web Intellgence reports

SCN Colleagues,

    I am creating two reports to show sales returns by region. I am using BI4 SP4. Source is BEx queres for all reports. Using BICS connection for Web intelligence report.

    First report has summary table that gives count of sales retuns by region.

   eg:

    Region     Sales return

    AFR          20

    EUR         40

etc.

When we click on region, it should open a child report, that gives details of products returned, customer, city etc.

I am usng the following syntax.

="<a href=\"../../opendoc/openDocument.jsp?iDocID=RBFT5HpAtEgEKdeY42c&sIDType=CUID&sType=wid&sRefresh=Y&lsMRegion%3A="+URLEncode(""+[Region])+"\" title=\"\" target=\"_blank\" nav=\"doc\">"+[Region]+"</a>"

Issue is region name is not changing as hyperlink.  Entire syntax is visible in the region column

Please please help.

Regards,

Nanda Kishore B