Missing something - Windchill Attribute creation mapped to ProE

Tried half dozen different ways but I just seem to be missing something in regards to attribute creation. The steps I just tried were:

1. Select “Site”--> Utilities--> Type and Attribute Manager


2. Click tab Attribute Definition Manger--> clicked New Organizer--> replaced com.acme. with PROE_ATTRIBUTES


3. Click on new organizer--> clicked “New Attribute”--> entered VENDOR for the name--> and String for data type


4. Click on tab Type Manager--> click on EPM Document--> edit--> click on tab Attribute Mapping--> click Add Mapping


5. Expand PROE_ATTRIBUTES pick VENDOR and click “Select


6. Double click on the empty Mapping field and enter VENDOR


7. Check-in EPM Document--> close Type and Attribute Manager


8. Launch ProE--> create a new file--> create and designate apptribute named VENDOR--> save file


9. Check-in the file--> successful


10. And here is my problem, when I check the Event Manager I get the conflict “Incoming attribute(s) VENDOR ignored as they are not part of type definition”