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How do I set up a field so that a change in a calculation in the field does not affect previously...

Question asked by JohnBarks on Jul 1, 2013
Latest reply on Jul 1, 2013 by philmodjunk

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How do I set up a field so that a change in a calculation in the field does not affect previously created records?

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     Hello Everyone,

       I have a few books on FileMaker development and I remember reading in one of them about how to set up a field so that a calculation change doesn't affect previously created records. For instance, I want to put all of my invoices into one database to make searching easier. But the way my database is set up now, if I change my hourly rate or the tax rates, it changes all of the past invoices as well. I cannot remember what to do to a field so that calculation changes do not affect already created invoices, only newly created ones. Can anyone help, please?

       Thanks,

       John B

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