occur in the directory listing, not in the order in which you list the exchanges in the
EXCHANGE statement.
If the name SAS file does not exist in the SAS library, PROC DATASETS stops
processing the RUN group that contains the EXCHANGE statement and issues an error
message. To override this behavior, specify the NOWARN option in the PROC
DATASETS statement.
The EXCHANGE statement also exchanges the associated indexes so that they
correspond with the new name.
The EXCHANGE statement only allows two existing generation groups to exchange
names. You cannot exchange a specific generation number with either an existing base
version or another generation ...
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