Expression in Where Condition

Hi,

Could you please help with the issue while iam trying to validate the expression in the where condition, iam getting below two errors:

1) length @Select(Dim\Fiscal Period\Fiscal Month)=1

2) Case

when

length @Select(Dim\Fiscal Period\Fiscal Month)=1

then

'00'||(@Select(Dim\Fiscal Period\Fiscal Month))||'.'||@Select(Dim\Fiscal Period\Fiscal Year)

else

'0'||(@Select(Dim\Fiscal Period\Fiscal Month))||'.'||@Select(Dim\Fiscal Period\Fiscal Year)

End

Thanks,

Dinya.