OTRS WebService / NewTicket - LDAP

Dear all, i'm using the GenericTicketConnector.yml (*), i don't have any problem to connect to otrs with local users; but in one box i'm using LDAP and I can't generate ticket due a authentication problem.I tried using flat AD user name, name@domain, etc.Any information will be appreciated !
PS: webservice response detail:
ErrorCode => TicketCreate.InvalidParameterErrorMessage => TicketCreate: Ticket-> CustomerUser parameter is invalid!
(*)GenericTicketConnector.yml: http://otrs.github.io/doc/manual/admin/3.1/de/html/genericinterface-connectors.html

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