Varaible entry Wrong

Hi All,

In a BEx report i have the selection Screen as

GL Account (Interval Mandatory)

Fiscal Yr (Single Value, Mandatory)

Posting Period ( Interval, Optional)

When i gv the the GL Account and Fisca Year as say 411012 and 2008, i get a pop up, saying that

"Entry For Fiscal Year variable is Invalid" Please check,

I have used the std variabe 0P_YEAR

Please help

Thanks