Ok then I think we're agreeing but using different bits of the same point. In Excel there is no culture of good data validation. My experience working as a deve

Ok then I think we're agreeing but using different bits of the same point. In Excel there is no culture of good data validation. My experience working as a developer in Python gave me that culture. Agreed. In GGGP's case they almost certainly have no tests so I stand by the recommendation that they fight hard to get a validation system in place. Probably by moving to Python and/or a RDBMS.