#243 Error msg can be modified - Book module

[Kamakshi]

Build : Beta 3

Description : If we give the same ISBN number for different books the error message " ISBN number already exists" should come instead of "impossible to perform save action".

[Janesh Kodikara]

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This is a problem for all duplicate entries. The error message is not user friendly.
This need to be fixed @ OpenXava side. We will work on this when major functionalities are implemented.