Sony MSW-900 Supplemental Operation Manual page 96

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When the country code is less than 4 bytes, the active part of the code
will occupy the first part of the 4-bytes and the remainder must be filled
with the space character (20h).
Example: In the case of Japan
For Japan, if the country code is JP, it is 2 bytes, if JPN, it is 3 bytes.
Thus, enter the following:
JP_ _
or
JPN _
where _ represents a space.
ORGANIZATION CODE
Displays the organization code.
When you select this item, the ORGANIZATION CODE window
appears.
Enter an abbreviated 4-byte alphanumeric string for the organization
code.
Note
There are no problems in recording or playing back audio-video signals,
if ORGANIZATION CODE is not set.
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Chapter 1 Using UMID Data