automatically CALCULATE() function is surrounded to a measure when it is inovked in a DAX expression

[arunaramana]

Hello There, 

I found the following information when going through the "Context Transition" documentation by "Alberto Ferrari /SQLBI".

Would anyone please help me understand?

It is worth remembering that when you invoke a measure from a DAX expression, this is automatically surrounded by CALCULATE. The automatic CALCULATE, added by DAX, performs context transition and it might become source of errors in your code.

• https://www.sqlbi.com/articles/understanding-context-transition/ Get clarity on this paragraph

[jdbuchanan71 · Accepted solution]

When you start working with iterators it is important to remember to use CALCULATE in order to trigger context transition.  If you use a measure you don't need to include that.  Because the 3rd measure uses another measure in the iteration your don't need the CALCULATE around it to get the correct answer.