Trying to make Asset/CI Managed by APM

Document ID : KB000074833
Last Modified Date : 02/05/2018
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I am trying to check the Managed by CA APM box on an asset. When I check the box I get a message:
Warning: The Asset could be a Configuration Item from CA SDM. Assign Model to this asset before saving it.

If I try to add a model I get an error:
You cannot change the Asset Family for an existing asset.
When you open the asset in APM, check the asset family and class. Also subclass if there is one. 
Choose a model that has the same asset family and class and save.