An error message that is to be displayed when a bind back error occurs on the control.
This property can be set for binding and validation errors and usually is set as part of ControlSource and ValidationExpression handlers that are called when binding and unbinding values. By assigning a message to this property you are overriding the default message binding error message.
See also:Class wwWebControl | wwWebControl::ValidationExpression | wwWebControl::ControlSource
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