How to check that a field value is unique before saving back to a SharePoint list?
I have an Input Screen with a Form where there is a text input field for an invoice number. I have a Save Icon that upon OnSelect Submits the Form and the data is saved to a SharePoint List. We need all invoice numbers to be unique to avoid duplicate entries. Although I can make the Invoice number column in SharePoint unique, there is no error message in PowerApps (or a useful one anyway) although a record with a duplicate invoice number cannot be saved.
How can I check for a duplicate entry upon Submit? I already have some code in OnSelect for the Save icon: SubmitForm(Form1); Set( selectedInvoice, Blank() ); ResetForm(Form1); NewForm(Form1)
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