Ganesh, based on your other post, it sounds like you are validating clinical data. The necessary edit checks should be defined by the data manager (maybe the statistician?). Greg's response summed it up. The necessary edit checks are protocol-specific. But there are global checks like date and time consistency, inclusion and exclusion criteria met, etc.

If no one has defined the edit checks in a data management plan (or something like it), then you should consult the protocol.