HOw to create variable With IF Statement or CASE in IDT?

Hi Experts,

Using BO 4.1 Support Pack 1 Patch 8

IDT  Enterprise AUT

Could you please help on this issue i'm unable to create variable

using IF Statement and Case Statement

I've tried but getting SQl driver error

but when i used database function and so on  it is working

only IF statement and Case Statement are not working

IDT will support IF and Case?

Thanks

Ravi Kumar