one-to-one association, howto

I've try to create one-to-one association from table Task to Supplier by define

model.association = [
  Association('Task', 'Supplier',multiplicity=[ [0, 1], [0, 1] ])
]

but the error said 

ValueError: invalid multiplicity dst->src: should be toMany

I've also apply the patch from
http://sourceforge.net/mailarchive/message.php?msg_id=9401573

Did I done something wrong?

Regrads
Wara Songkran


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