Seafreight must not shown on on B/L

Hi, I’ve found the following phrase on an English exam paper:

SEAFREIGHT MUST NOT SHOWN ON BL - HANDLE WITH CARE - STOWAGE UNDER DE CK - SHIPPER’S LOAD, STOWAGE AND COUNT - PROTECT FROM EXTREME TEMPERATURES

Now, I do understand that B/L stands for ‘Bill of Lading’ but what does the phrase ‘Seafreight must not shown on BL’ mean?

Many thanks,
Torsten

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