synchronize navision and outlook

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Hi everybody
when I enable synchronize outlook in navision, any salesperson or any contacts in navision copy to outlook, but when I type new contact in outlook I can`t copy it to navision, when I import contact to navision this message shows to me:
"you must specify contact Nos. in relationship management setup primary key=". OK "
microsoft outlook 2003 Sp1 , microsoft dynamics navision V4 sp1, microsoft exchange 2003 sp1.
any help or idea? [-o<