For a BUFR file containing GTS bulletins with BUFR BUOY messages, the following output to STDERR was produced when using option --strict_checking 1:

BUFR.pm WARNING: Compression set in section 1 for one subset message at /metno/local/bin/bufrread.pl line 143
BUFR.pm WARNING: Compression set in section 1 for one subset message at /metno/local/bin/bufrread.pl line 143
BUFR.pm WARNING: Compression set in section 1 for one subset message at /metno/local/bin/bufrread.pl line 143
BUFR.pm WARNING: Compression set in section 1 for one subset message at /metno/local/bin/bufrread.pl line 143
BUFR.pm WARNING: CCITTIA5 minval not all bits set to zero but '000000000000' at /metno/local/bin/bufrread.pl line 143
BUFR.pm WARNING: CCITTIA5 minval not all bits set to zero but '000000000000' at /metno/local/bin/bufrread.pl line 143
BUFR.pm WARNING: Compression set in section 1 for one subset message at /metno/local/bin/bufrread.pl line 143

Output to screen is exactly as if --strict_checking had not been used (in which case nothing is printed to STDERR). If using --strict_checking 2, however, the problematic messages are left out from output to screen (which therefore starts with Message 6), while output to STDERR now changes to:

BUFR.pm ERROR: Compression set in section 1 for one subset message at /metno/local/bin/bufrread.pl line 143
In message 1 contained in bulletin with ahl IOZX11 LFVW 052100 CCR
BUFR.pm ERROR: Compression set in section 1 for one subset message at /metno/local/bin/bufrread.pl line 143
In message 2 contained in bulletin with ahl IOZX11 LFVW 052100 CCS
BUFR.pm ERROR: Compression set in section 1 for one subset message at /metno/local/bin/bufrread.pl line 143
In message 3 contained in bulletin with ahl IOZX11 LFVW 051800 CCX
BUFR.pm ERROR: Compression set in section 1 for one subset message at /metno/local/bin/bufrread.pl line 143
In message 4 contained in bulletin with ahl IOZX11 LFVW 060000 CCC
BUFR.pm ERROR: CCITTIA5 minval not all bits set to zero but '000000000000' at /metno/local/bin/bufrread.pl line 143
In message 5 contained in bulletin with ahl IOZX11 LFVW 060000 CCD
BUFR.pm ERROR: CCITTIA5 minval not all bits set to zero but '000000000000' at /metno/local/bin/bufrread.pl line 143
In message 7 contained in bulletin with ahl IOZX11 LFVW 060300
BUFR.pm ERROR: Compression set in section 1 for one subset message at /metno/local/bin/bufrread.pl line 143
In message 9 contained in bulletin with ahl IOZX11 LFVW 052100 CCT