Show if column is not valid

I have two columns named “UPC” and “UPC check”.

When “UPC” is keyed in wrongly, “UPC check” will be shown for users to check why was it not valid.

Is this possible?

@Laura_Hong
How do you know when it is keyed in wrongly?

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Probably.

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This might be of help:

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i’ll look up to a master table where all the data will be stored.