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Super User

Re: How to check that a field value is unique before saving back to a SharePoint list?

@sajarac 

Try changing your formula to this:

If(
   IsBlank(Trim(DataCardValue5.Text)), 
      "A Country Code is required",   
   CountRows(Filter(Country, CoO_Code = Value(Trim(DataCardValue5.Text)) ) > 0, 
      "Duplicate Code not allowed",
   ""
)

Note the use of the Value Function

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