Cobol redefines are similar to choices and provide a set of
alternatives.
In previous versions, you set expressions on each alternative to help the Cobol reader
determine which alternative applies. With the latest implementation, the Reader tries each
alternative in turn when expressions are removed.
The Cobol Reader starts with the first alternative. If it encounters an error, the Reader
tries the next alternative until it finds an alternative that matches the data.
More than one alternative may match the data. In this case, the Reader picks the first one
that appears. If you are unsatifisfied with the behaviour, you can set your own
expressions.
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