Is it possible to connect a1 with b1 twice on (object diagram), while A has only one B object and it is {nonunique}?
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nonunique constraint has sense only if upper multiplicity is higher than zero (while of course you are still allowed to use it anyway). It means that in a particular association with a specific object the same object on the other side can be used more than once.
I believe that's what you wanted to achieve, however the constraint should be on the other end of the association (the one with multiplicity *).
Ister
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Your diagram shows just classes. Objects have an underlined name and usually do not show compartments.
The {nonunique} constraint in the multiplicity just tells that B must not be unique.
The double association between a1 and b1 is absolutely legal. However, without a role name it's rather pointless and a single association would be enough.
qwerty_so
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