In SQL Server you can do custom error messages with Raiserror. Do you have something similar in Firebird?

>>Why don't you validate data on front end to avoid the error?
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>I was hoping the back-end can do this better.
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>>Why do you refresh the form instead of handling the error?
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>This is where the CodeBook comes in and as there are no error number attached to this else I was hoping to handle this in the error routine or something similar.
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>Hope I have made sense. Thanks.