<eStructuralFeatures xsi:type="ecore:EReference" name="ref1" eType="#//Class1"/>

Error loading platform:/resource/mergeTransTest/model/m3in.ecore: The feature 'lass1' is not a valid feature

<?xml version="1.0" encoding="UTF-8"?>
<ecore:EPackage xmi:version="2.0"
    xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:ecore="http://www.eclipse.org/emf/2002/Ecore" name="m3in"
    nsURI="http://m3in/1.0" nsPrefix="m3in">
  <eClassifiers xsi:type="ecore:EClass" name="Class1">
    <eStructuralFeatures xsi:type="ecore:EAttribute" name="ID" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EInt"/>
  </eClassifiers>
  <eClassifiers xsi:type="ecore:EClass" name="Class2">
    <eStructuralFeatures xsi:type="ecore:EReference" name="ref1" eType="#//Class1"/>
  </eClassifiers>
</ecore:EPackage>

-- @path Ecore=platform:/plugin/org.eclipse.emf.ecore/model/Ecore.ecore

module merge;
create OUT : Ecore from IN : Ecore;

rule copyEPackage{
	from
		a : Ecore!EPackage
	to
		p : Ecore!EPackage(
			eClassifiers <- a.eClassifiers,
			name <- 'out',
			nsURI <- 'http://out/1.0',
			nsPrefix <- 'out'
		)
		
}

rule copyEClass{
	from
		a : Ecore!EClass
	to
		p : Ecore!EClass(
			name <- a.name,
			eStructuralFeatures <- a.eStructuralFeatures
		)
}

rule copyEAttribute{
	from
		a : Ecore!EAttribute
	to
		p : Ecore!EAttribute(
			name <- a.name,
			eType <- a.eType
		)
}

rule copyEReference{
	from
		a : Ecore!EReference
	to
		p : Ecore!EReference(
			name <- a.name,
			upperBound <- a.upperBound,
			lowerBound <- a.lowerBound,
			containment <- a.containment,
			eOpposite <- a.eOpposite
		)	
}