Different result from expected same expression

[Broly]

Hi guys,

here is the script which I am using:

LoadPerf:
load Distinct
SHIPMENT_ID,
if((A_MDE_LOADING_FINISHED = 0) and LASTACTION_DATA_SOURCE = 'MDE',
(num(A_LOADING_CLOSE_TIME) - MinLoadTimeUG ),
(num(A_MDE_LOADING_FINISH_TIME) - MinLoadTimeUG )) as ClosingTime

resident temp;

as you can see the last expression is valid, and the one before it is not.

Do you know why is that?