Directory Connector: "An error occured while creating object: Failed adding item UserCertificate" (4350015)

A contact object is not created in the target environment and the following error can be seen in the Directory Connector log file:

Failed operations:
 Testuser1 error: An error occured while creating object TestUser1: Failed adding item UserCertificate
An operation error occurred.
 Operations type: Provision
    Source attributes:
       Name=Testuser1
       Path=CN=Testuser1,OU=Users,DC=domain,DC=com
       ParentPath=OU=Users,DC=domain,DC=com
       extensionAttribute2=Y
       objectGuid=XXXXXXXXXXXXXXXXX
       proxyAddresses=sip:Testuser1@domain.com
       proxyAddresses=smtp:Test_User1@domain.com
       proxyAddresses=smtp:Testuser1@tenant.onmicrosoft.com
       proxyAddresses=smtp:Testuser1@domain.com
       proxyAddresses=SMTP:Test.User1@domain.com
       mail=Test.User1@domain.com
       description=Test User1 | 2/26/2014 9:22:14 AM
       givenName=Test
       sn=User1
       cn=Testuser1
       sAMAccountName=Testuser1
       title=Test
       userCertificate=00000000-0000-0000-0000-000000000000
       company=COMPANY NAME
       department=Marketing
       physicalDeliveryOfficeName=XXX-XXX

The following procedure should resolve this issue:

1.) Open the CMN Management Console.

2.) Locate the Directory Connector in question.

3.) Right-Click on the connector and select Advanced Settings.

4.) Click the "Users" tab.

5.) Click the "Provision Attributes" tab.

6.) Click the "userCertificate" attribute.

7.) Click the "Remove" button.

8.) Click OK.

9.) Click the "Update Attributes" tab.

10.) Click the "userCertificate" attribute.

11.) Click the "Remove" button.

12.) Click OK.

13.) Save | Activate | Run the Directory Connector.