The BWM contracts in the group. The contracts are presented
in bitmap format.
in receiving order:
OCTET 1 OCTET 2 .....
xxxxxxxx xxxxxxxx .....
| || |_ contract 9
| ||
| ||___ contract 8
| |____ contract 7
| . . .
|__________ contract 1
where x : 1 - The represented contract belongs to the group
0 - The represented contract does not belong to the group