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Input Form - Validation Rule to check that a value does not Exist

It would be a good addition to be able to make sure a value added to a field on a form does not exist within the data i.e. must be unique.


Example adding a new Product.

The SKU code is the Unique key. 

So when I created new product this must be unique within the Data

If I enter 001 on the form I would like it to check the Field SKU Code in the Data and if it exist fail the validation.

  

Thanks 

Mark  

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