ambiguous-export-flow-to-single-valued-attribute

This was absolute nightmare. Got a call from a manager that the org browser is not showing correct info and later checked in AD, everythis was alright but in UPS info wasn't correct.

Completed a full synchronization that didn't resolve this. On further research found ambiguous-export-flow-to-single-valued-attribute was causing the issue.

Logged on to the server where User Profile Servie was running.
Launched the Synchronization Service Manager from here:

C:\Program Files\Microsoft Office Servers\14.0\Synchronization Service\UIShell > miisclient.exe

Click on Management Agents
Found the following three agents

Name                                       Type
ILMMA                                   FIM Service Management Agent
MOSS-244-GUID                   Extensible Connectivity
MOSSAD-AD Sync               Active Directory Domain Services

Selected Moss-224-GUID , in the lower right panel found 2000+ entries with ambigious-export-flow-single-value-attribute error

Found Manager metaverse and data source attribute is casuging this error



Now Click on Metaverse Designer, Select Person, this object contains the manager attribute

In the Lower right corner, Under Actions ,Click on Add Attribute

This opens Add Attribute To Object Type.
Click on New Attribute

Created a new attribute with name mgr
Attribute Type as Refernce(DN)
Select Mutli-Valued box
Click Ok

Now Click on Management Agents to assign an attribute flow
Right Click on MOSS-24-GUID  and select Properties

From the left panel , Click on Configure Attributes
Select Manager and Click on Edit
Now select the check box;: Attribute is a multi-valued
Click Ok

Had to configure the new mgr attribute.

Click on Configure Attribute Flow

Expand Object Type: User and scroll down till you see Manager attribute

I have mapped the Manager data source attribute with mgr metaverse attribute with the following options

I would suggest delete the existing manager one and click on New to create a new flow

Select Data Source Object type as User and Attribute as Manager

Select Metaverse Object type as Person and Attribute as mgr

Click Ok and go back to the properties to see the new mapping exists

I now had taken care off the MOSS-24-GUID but now had to apply the same settngs for MOSSAD-AD Sync 
I.E. Go to the Properties for MOSSAD -AD Sync
From the left panel , Click on Configure Attribute  Flow
Delete the existing Manager attribute
Click on New

Select Data Source Object type as User and Attribute as Manager

Select Metaverse Object type as Person and Attribute as mgr

Click Ok

Once this is done, reset the IIS
Run a full synchronization and now everything works for me. I see all profiles being imported into SharePoint from AD

This resolved the issue for me but you may have to identify which attribute has got an issue and sort it out accordingly would suggest to test this on Test environment before appyling the change in Production.

Please note this issue is fixed in December 2010 CU.