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 142
BUFR.pm WARNING: Compression set in section 1 for one subset message at /metno/local/bin/bufrread.pl line 142
BUFR.pm WARNING: CCITTIA5 minval not null bytes but '000000000000' at /metno/local/bin/bufrread.pl line 142
BUFR.pm WARNING: Compression set in section 1 for one subset message at /metno/local/bin/bufrread.pl line 142
BUFR.pm WARNING: CCITTIA5 minval not null bytes but '000000000000' at /metno/local/bin/bufrread.pl line 142
BUFR.pm WARNING: Compression set in section 1 for one subset message at /metno/local/bin/bufrread.pl line 142
BUFR.pm WARNING: Compression set in section 1 for one subset message at /metno/local/bin/bufrread.pl line 142
BUFR.pm WARNING: CCITTIA5 minval not null bytes but '000000000000' at /metno/local/bin/bufrread.pl line 142

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 4), 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 142
In message 1 contained in bulletin with ahl IOZX11 LFVW 050300 CCX
BUFR.pm ERROR: Compression set in section 1 for one subset message at /metno/local/bin/bufrread.pl line 142
In message 2 contained in bulletin with ahl IOZX11 LFVW 050300 CCX
BUFR.pm ERROR: CCITTIA5 minval not null bytes but '000000000000' at /metno/local/bin/bufrread.pl line 142
In message 3 contained in bulletin with ahl IOZX11 LFVW 050600 CCX
BUFR.pm ERROR: Compression set in section 1 for one subset message at /metno/local/bin/bufrread.pl line 142
In message 6 contained in bulletin with ahl IOZX11 LFVW 050600 CCX
BUFR.pm ERROR: CCITTIA5 minval not null bytes but '000000000000' at /metno/local/bin/bufrread.pl line 142
In message 7 contained in bulletin with ahl IOZX11 LFVW 050900 CCA
BUFR.pm ERROR: Compression set in section 1 for one subset message at /metno/local/bin/bufrread.pl line 142
In message 9 contained in bulletin with ahl IOZX11 LFVW 050000 CCX
BUFR.pm ERROR: Compression set in section 1 for one subset message at /metno/local/bin/bufrread.pl line 142
In message 10 contained in bulletin with ahl IOZX11 LFVW 050300 CCX
BUFR.pm ERROR: CCITTIA5 minval not null bytes but '000000000000' at /metno/local/bin/bufrread.pl line 142
In message 11 contained in bulletin with ahl IOZX11 LFVW 051000