macro trigger based on the result of a formula (whenever the formula for calculating)

Hi.
Please could someone review the code below and tell me if it is possible to adapt the event worksheet to work through the formula.
This code is great, works just right for my needs, but it only works when I do manual entry but the cell that will be changed in my spreadsheet and what is the trigger is changed by formula. I realized that if I give a formula enter the code works.

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Hi

Any idea?

Thank's