JBDS Teiid Designer shows "SQL transformation in the model model1 contains the unresolved reference file:/path/to/model2.xmi" errors on imported project set

Issue

• A project that was created in JBoss Developer Studio (7.1.1.GA-v20140314-2145-B688) with Teiid Designer (8.3.4.Final-v20140912-1304-B264) results in numerous errors when imported into JBoss Developer Studio (8.1.0.GA-v20150327-1349-B467) with Teiid Designer (9.0.1.Final-v20150211-1407-B643).
• Previously working model set shows large number of errors after being imported into a new version of Teiid Designer
• Build of the project results in large numbers of errors like

Sql transformation in the model model1 contains the unresolved reference file:/path/to/model2.xmi