Insufficient access rights to perform the operation error while Syncing users in Forefront Identity Manager

Hi All

I am new to FIM and I have few users which I am not able to Sync in FIM and getting the error "Insufficient access rights to perform the operation error"

Details of my setup

I have a forest AAA.local as forest

Domain -1:abc.aaa.local  and Domain 2: xyz.aaa.local and email is associated to only one domain controller. I have few users who's have accounts in both domains and their logon ID is same in both domain controller

abc

First Name :- Test User 5
Last Name :- FIM
Display name :- FIM, Test User 5
Logon name :-fimpasmx5
E-mail :- none

xyz

First Name :- Test User
Last Name :- FIM
Display name :- FIM, Test User
Logon name :-fimpasmx5
E-mail :- fimpasmx5@p*****.com

When the account is Synced in FIM e-mail is taken from domain 2 and first name & last name is taken from domain-1.

Can you please help me when user have same logon name in both domain how to sync both domain ID in FIM

Permissions on OU are fine as other accounts which exists only in one domain (abc or xyz) are able to sync.

Appreciate your help