Crystal Reports Blank Space is getting while using grouping

Message

   Hi All,

I am using one group based on the conditions.

so i created a formula field.

eg:
I put the below code in the formula.

if report type=1
command.customer
else
command.manager

If user selects 1 report is working fine.
But other than 1 selects a blank page is displayed in the second page after that report is generated. First page is Some Report headers are there.

Even i put the suppres blank codition it is not working.

I also removed the keep together option.

Note : If changed condition instead of manger if i put city then it is working fine.

thanks in Advance

Regards,
SarathChandra V.