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Within SAS Component Language (SCL) prior to SAS 8.2, the ATTRN function
with the NLOBSF attribute automatically fetched the first observation of
the data in its internal processing. This meant that if you followed
ATTRN with a function that needed a current observation such as
GETVARN/C, it would read from the first observation.

However, since fetching the first observation was not documented and the
need arose to retrieve the information for ATTRN with NLOBSF in a
different manner, an internal change was made starting in SAS 8.2 and
the first observation is no longer automatically fetched. This means
that a GETVARC/N function immediately following ATTRN with NLOBSF would
fail because there is no current observation from which to read.  Users
should do an explicit fetch using the FETCH or FETCHOBS functions.

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