SAP BW, IF for your BEx formulas

Have you ever felt the need for an IF in your BEx formulas? Didn't find it? That's because SAP expects you to know about boolean math ...
See, we are subtracting two quantities and we want our result to be shown as 0 if the actual result is negative, the trick is very simple, look at this example:

( ( 'GR quantity' - 'PO quantity' ) > 0 ) * ( 'GR quantity' - 'PO quantity' )

The first block will evaluate to 1 when GR quantity is greater than PO quantity and to 0 when it's smaller, so the result will be something like:

GR quantity: 6
PO quantity: 4

(( 6 - 1) > 0) * (6 - 4) will turn into 1 (true) * (6 - 4) = 2

The other case:

GR quantity: 4
PO quantity: 7

(( 4 - 7) > 0) * (4 - 7) will turn into 0 (false) * (4 - 7) = 0