Set Field Calculation Order
When there are multiple calculations in a form, they are performed in the order you defined, and sometimes it takes a specific order to get correct results.
For instance, in order to use the result obtained from calculating form field A and B to calculate the value of a third form field C, A and B must be calculated together first to get the correct final results.
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Choose Form > Set Field Calculation Order to open the Calculate Fields dialog box, which displays all calculable fields in your form and the order in which the calculations are carried out.
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To modify the field calculation order, select the field from the list, and then click the Up or Down arrow button
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Click OK.
Note: when you create or test form fields, Right PDF will automatically perform all calculations. You can go to Preferences > Forms and deselect Automatically calculate field values to disable this.