How to script if-else condition in dynamic update action

[#1]

Hello QlikView community,

I'm facing the problem to script a (simple) if-else condition in Qlikview.

I want to pull a trigger when changing the value of a variable (variable event trigger , to be specific the "OnInput" option).

When adding the dynamic update action, I want to change a fieldvalue with the string I just entered into the variable.

The code looks like this :

if  '$(vCostCentre)' = '' then
  UPDATE ProfitCenterMap
  SET ProfitCenterMap.CarveOutCategory ='$(vClassification)'
  WHERE LineItem.ProfitCentre = '$(vProfitCentre)' ;
else   
  UPDATE CostCenterMap
  SET CostCenterMap.CarveOutCategory = '$(vClassification)'
  WHERE LineItem.CostCentre = '$(vCostCentre)' ; 
end if

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I read the qlikview reference Manual and wrote the script above according to: https://help.qlik.com/de-DE/qlikview/12.0/Subsystems/Client/Content/Scripting/ScriptControlStatement...

I also found another Syntax here IF & Else condition :

Simple if function:

if(condition , then , else)

Thank you in advance.

Tuan