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Power Platform Community / Forums / Power Automate / Calculate two feilds i...
Power Automate
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Calculate two feilds in Update a row action

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Posted on by Isanka Thalagala 17

I have added a new culumn to QuoteProduct entity as 'Price Inc GST'.

 

Then I need to create a Workflow to calculate tax value and assign update tax feild with calculated tax.

 

Formula is like this

   Tax = (Price Inc GST - Price Per Unit) * Quantity

 

This is the way I tried.

IsankaPT_0-1677155775381.png

 

I tried this expression to update a row and assign the calculated value to the Tax Feild. But gives a error

 

coalesce(triggerBody()?['quantity'], 0) * (coalesce(triggerBody()?['e360_priceincgst'], 0) - coalesce(triggerBody()?['priceperunit'], 0))

 

IsankaPT_1-1677156001979.png

 

I'm new to Power Automate and hit a wall

 

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  • Verified answer
    Chriddle Profile Picture
    Chriddle 8,729 Super User 2026 Season 2 on at

    There is no * or - operator in PA expressions, use functions sub() and mul().

    Btw, if your trigger is "When a row is added, modified ..." it is not a good idea to modify the row in the flow without a check, because this triggers your flow again and again ....

    Before updating, check if the update is needed!

  • Isanka Thalagala Profile Picture
    Isanka Thalagala 17 on at

    Actually it worked.. Here I have mentioned it for the fureture referance

     

    mul(coalesce(triggerBody()?['quantity'], 0),sub(coalesce(triggerBody()?['e360_priceincgst'], 0) ,coalesce(triggerBody()?['priceperunit'], 0) ))

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