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#815578
Create a trigger that will be executed after the Dynaform with code like this:
Code: Select all
@#gridSum = 0;
if (!empty(@=myGrid)) {
    foreach  (@=myGrid as $aRow) {
         @#gridSum += (float) $aRow['amount'];
    }
}
Where the variable associated with the grid is "myGrid" and the ID of the field inside the grid is "amount".

Then in your gateway, you can use a condition like this:
@#gridSum >= 500

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