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Error 500 in website when validating VATdoor
I am validating the VAT using a constraint in the web client, in order to disallow repeated VATs in partners.
When I ask for the VAT in the website form and this VAT already exists, the constraint cause a warning (which is visible in the server log) but I get a 500 internal server error in the website.
How can I impelment apopup, or similar in the website when there is such situation?