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Lim, This is common in other environments. You could have both xxx_v1 and xxx_v2 versions in production at the same time. Not every program would have to be modified to use the _v2 version. They could remain in place using the _v1 version. With both versions available you can take your time (or never finish) converting the calling programs over to xxx_v2. This makes upgrading the system an easier proposition. You upgrade smaller pieces of your application instead of a 'big bang' upgrade. Paul
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