A material condition modifier has not been specified for a datum feature of size. 
Do the following to resolve this message: 
- Click the message in the Tolerance Advisor browser to cross highlight the feature in the model browser. 
  
- Right-click the model browser entry and select Edit DRF. 
  
-  Specify a material condition modifier for the datum feature of size in the Datum Reference Frame dialog box. 
	   
 
- Click OK.