When saving data form with checking duplicate data (unique index on columns) the generic error message popup is displayed. This is not enough for generic user - would be better if programmer could make own error message.
Suggestion: Catch an error on modeled index and in Documentation make possibility assign proper user message (like a user documentation)
It has been possible to work with unique index errors through modeling a unique index in the model since 2015.11. It works beautifully with string based indexes, e.g. invoice numbers. There is an improvement request pending though for cases when the index is composed of guid values here.
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