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Why Auto-Enter Calculated value?

Question asked by ChrisJohnston on Dec 5, 2015
Latest reply on Dec 6, 2015 by ChrisJohnston

Recently I was asked by a colleague to help them construct a catalog style FileMaker layout for a set of products. I remembered reading about a way to do this. I had saved a page that showed how here. I found this article to be very helpful. I used the same technique, but only the relationship method (not the filtered portal part), and modified it to fit my need by adding portals that start a different record. I understand that this relationship is selecting subset of the records into a multi-key that is the amount of the records per page. The part I do not understand is why the matched field of the relationship needs to be an Auto-Enter Calculated value? Why could It not just be a calculation? I have to admit that I have never known how to reliably work with Auto-Enter Calculated value in the first place. Could someone explain why it is necessary here, also maybe explain anything important to know about them. Thanks