Hi Rizwan,
Apologies, I completely missed this question.
The general rule is that for every ':' you indent by one TAB. For example:
Value = 'There is a user' Value1 = 'There is no user' if Incident.RaiseUser != null: return Value else: return Value1
The calculation editor will insert a TAB after a ':' but sometimes you need to change it especially, if you have gone back and made code changes.
There are one or two (thousand!) calculations in your build to refer back to!