Formula Field Problem On Crystal Reports

Question

I have design Crystal reports For Ledger Of Accounts. There are Two types of Ledger

1.) One On One Page and Other is 2). Many on One page.

I have set Opening Balance Field Which is set by Formula Field on GroupHeader Section.

So what I comes to know that when I select the reports for single accounts than the Opening

Balance formula Field Shows but if I choose many accounts than Opening Balance formula

Field are not showing.

The Details of Formula filed is:

formula field Name is @OPDebit 
The Formula Coding is : NumberVar bbc:= ToNumber({AccountMast.opbalDR})
It is Suppress on : currentfieldvalue=0 
Location of Formula is on GroupHeader Section

Is there connection of Formula Field between Single page and Multiple Page?.

So what's wrong with this?. What is the matters and solution?.

The above both reports is for Multiple ledger Display.