Conditional Header and Footer in RTF template

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 I want to display one message if parameter is null.

I used

<?if:ACCT_ID='MAND'?>

****No Report Output***  

<?end if?>

<?if:ACCT_ID!='MAND'?>

the whole document

<?end if?>

but in first case header and footer is also getting displayed. Can we avoid this?

Thanks.

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