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Secondly, I'm not sure exactly why would you get the confirmation twice (I never do) so you might want to provide some extra info (which version are you using) and potentially isolate it in a sample.
However, for some reason, the value calculated by the formula does not update automatically. We already had the calculation options set to automatic and didn't know why values weren't updating.
Because you're updating INV_TOTAL with INV_DISCOUNT, and the database is going to use the I guess the issue here is that you are updating INV_DISCOUNT and the INV_TOTAL uses the INV_DISCOUNT. You can use returning clause of update statement to use the new INV_DISCOUNT and use it to update INV_TOTAL.
If you love the idea of building powerful business applications with Drupal, you may consider using ERPAL Platform as a base for your business application. For more information please see the ERPAL Platform project page.I had a case of this just now on Excel 2010: a particular spreadsheet that would not auto-recalculate.I changed the setting as indicated above; but the auto-recalculate still did not work, and upon rechecking the "Calculation" option, found it had reset itself back to "Manual" all by itself.At the request of our forum community we've prepared a short list of the Joomla, Word Press and Drupal plug-ins recent fixes: Please note that this update may not work for you if your free upgrade period has expired.You are welcome to continue using the version you purchased indefinitely, including all updates released during your upgrade eligibility.