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How to change a calculation formula without affect old records?

Question asked by Angelus81 on Mar 21, 2016
Latest reply on Mar 21, 2016 by Mike_Mitchell

I have a calculation that calculate how many glue is using per each product during production.

Below is one of my calculation:


Case (

Unit = "PARR" ; QTY * 2 * Glue_Usage::DJ_11 / 1000 ;

QTY * Glue_Usage::DJ_11 / 1000


However, now one of the product's glue usage is changed, if I update it on my filmmaker database, it will also affect my old record.

In this case, what should I do?

Please HELP!!!