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In rare cases, a record may have more than one reference field. Each of the identifier values will uniquely identify the record. However, Pedro will use the first identifier value it encounters.
When Pedro writes data out to a file, it writes out these values to indicate that one record points to another. If the identifier value is blank, Pedro has difficulty figuring out how to reference the record. The application will get confused when it tries to read the file.
Undefined references can arise under the following circumstances: