AX 2012 R2: Model import: same key has already added

Hi,

I am upgrading a previous AX 6.0 database with our ISV code to the new ISV code but then on AX 6.2. The code upgrade is done. So the next step is to do a data upgrade, in-place. During the import of our new ISV model I get the following error.

ERROR: An item with the same key has already been added

Some elements are successful renamed. But now I am stock on the above message. Does anyone knows how to determine which element is causing this?

Thank you.

Tom