Boolean Conditions- If Else statements

Hi BW Guys,

I have an extractor brining in the following fields and need to do some condition checks:

ZZEINDT- Item delivery date

ZBLDAT- Document date in document

ZZOUT- Quantity recieved but some outstanding

I need to set up the following boolean in BEx but not sure how I can do this:

If ZZEINDT >= ZBLDAT and ZZOUT <= 0.

FieldA = 1.

Else.

FieldB = 0.

Endif.

How do I tell BEx that I need to assign a value of 1 or 0 depending if the condition is met or not.

Can anyone explain how this will be done in BEx.

Thanks

Depesh