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How do i do calculation with fields between two different modules?

Question asked by Yuenchee Chan on Jul 31, 2015
Latest reply on Jul 31, 2015 by Yuenchee Chan

I have 2 different modules:

Module A has 3 fields.

-Points payable: 300

-Points balance: -100(i want it to deduct the "points payable" from "points",)

   

-Points:200(it to be hidden)


            

However for my "Points", i want to retrieve it firstly from Module B, then updates Module B's "points" from here.


Module B has 1 field. 

              

Points:200(update from hidden field in Module A)


Is it possible to do this? May i have the steps please? 

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