Quick help in if formula

[#1]

Unfortunately today I've got problem with connection to my databases. I'm trying from few days build customer segmentaion. Probably "I'm in home" but I need to know if below code is correct. I can't check this with QV file. I'm interesting of cheking if formula with and

Segment:
load
[Client number],
[BU],
[Factory],
[Sales person (Client)],
if([Factory]='NAM', 'FIRE',if(([Sales person (Client)]='170013' and
 [Factory]='PRU'), 'PROJEKTY',[BU])) as [Business Unit]
resident Sales;

[#2]

Syntax seems to be correct

[#3]

Thanks a lot:) This really simplify my work:):)