MS Project integration - Resource Names not working

Hello,

I'm trying to synchronize some content between PTC-Integrity and MS Project.

Everytime I try to synchronize the "Assigned User" of an Integrity-Taks with the the "Resource Names" field of a MS Project-Task the resource is added to the project but NOT assigned to the Task. How can this happen?

I feel like it was working when I started to work on the mapping but I'm not sure and going back to the starting point with the mapping does not make any difference...

My log:

Command: dm mapitem --map=AAAAAAAAAA MS Project Mapping --action=put --integration=MKSProjectTemplate-1:635254522220646454 ISSUE:3 Task.MKS Issue:2092215

Entering IssueHelper.synchronizeItems()

Retrieving updates for task linked to 2092215

Leaving IssueHelper.synchronizeItems()

Creating 0 new tasks ...

Updating Task 2 with field Task.Resource Names, value <mksUserName>

Assigning resource name: <mksUserName>

Resource <mksUserName> already exists.  Re-assigning user <Lastname, Firstname>

Appending resourceUnits to resource: 100

Updating resource: <Lastname, Firstname>[100%,R]

Updating Task 2 with field Task.Work, value 54

Updating Task 2 with field Task.Finish, value

Updating Task 2 with field Task.Name, value My Test Task IM 2 MPP

Updating Task 2 with field Task.Notes, value my desc

Updating Task 2 with field Task.MKS Issue Type, value Task

Updating Task 2 with field Task.MKS Issue, value 2092215

Leaving resyncSelected_Click...

Coresponding mapping part:

I'm using Integrity 10.1 Server with 10.3 Client and MS Project Standard 2003.

Is somebody doing the same and it is working fine?

Has somebody an idea why this is not working for me?

best regards