Reference data mapping in 1IM to 1IM Sync project where UID's are different

Question

Hi All, 
 
 I had thought this would have a simple solution, so perhaps I am missing something obvious. I am setting up a sync project (v7.1.4) from one 1IM environment to another one 1IM environment. 
 The only issue is the UIDs in use are different on both environments, so some virtual properties are needed in the mapping (for this example, UID_PersonHead). 
 On the left side I have the following virtual property: 
 Name: vrt_ManagerCentralAccount 
 Type: Object Reference 
 Route: UID_PersonHead.UID_PersonHead.CentralAccount 
 On the right side I have the following virtual property: 
 Name: vrt_PersonHead 
 Type: Key Resolution 
 Base Property: UID_PersonHead 
 Schema: Person 
 Search Property: CentralAccount 
 Result Property: UID_Person 
 
 I then have a mapping between these 2 properties with the direction being towards target system. 
 
 Checking the UID_PersonHead field on both 1IM DBs I can see they have a value, however if I run the sync the result is the UID_PersonHead value being updated with a null value. 
 
 Any clues on where I am going wrong?

Tomi Kääriäinen · Answer

For the mapping mentioned using object reference loads unnecessary data. Use key resolution by reference. 
 The mapping would be 
 On the left and right side the following virtual property: 
 Name: vrt_ManagerCentralAccount 
 Type: key resolution by reference 
 Base property: UID_PersonHead 
 Search property: CentralAccout 
 
 Then you map these two virtual properties which each other. 
 
 By the way the example mapping in object reference is for the name of manager's manager. The example UID_PersonHead.UID_PersonHead.DisplayName is correct. For this case we need only the the manager's centralaccount. 
 
 Your welcome, 
 Tomi