Hi Dan

>This check should be implemented as a business rule as discussed in the "Specifying and Creating Business Rules" in the Developer's Guide.

Thanks for your response. But I must confess I am using CodeBook as my framework and MM being very similar I posted my question here. If I am to put this in the BO can you please let me know if it should be in BeforeSave() BeforeSaveValidation() or the AfterSave() methods and that too before or after the DODEFAULT().

Please advise.