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    $FE_UTI_BY_TT{'211'}{''}   = 3003;

'' is used for the carrier if the transaction applies to all carriers.
If you want to determine whether this is the case programmatically,
first check $FE_UTI_BY_TT{$tt}{$carrier}, if that doesn't exist (you can
use a simple boolean test), use $FE_UTI_BY_TT{$tt}{''}.  You can use
uti_by_tt_carrier() to do this for you.

=item %FE_RQ

RQ == required.  Maps from UTI to a list of field tags that UTI requires.
Eg,

    $FE_RQ{1005} = [0,10,498,3025,29];

=item $FE_* hash refs

Also exported for backwards compatibility are hash refs for the %FE_RE,
%FE_SE, %FE_TT, and %FE_RQ hashes.  Eg, you get $FE_RE, a reference to
%FE_RE.  These reference the raw underlying hashes, the % versions are
read-only and they croak if you try to use a non-existent key.  You