diff --git a/src/Famix-Fortran77-Entities/FamixF77ExternalDeclaration.class.st b/src/Famix-Fortran77-Entities/FamixF77ExternalDeclaration.class.st
index 1068d32..cb5e475 100644
--- a/src/Famix-Fortran77-Entities/FamixF77ExternalDeclaration.class.st
+++ b/src/Famix-Fortran77-Entities/FamixF77ExternalDeclaration.class.st
@@ -5,6 +5,11 @@ Im a external declaration.
 Class {
 	#name : #FamixF77ExternalDeclaration,
 	#superclass : #FamixF77NamedEntity,
+	#traits : 'FamixTSourceEntity',
+	#classTraits : 'FamixTSourceEntity classTrait',
+	#instVars : [
+		'#programUnit => FMOne type: #FamixF77ProgramUnit opposite: #externalDeclarations'
+	],
 	#category : #'Famix-Fortran77-Entities-Entities'
 }
 
@@ -16,3 +21,26 @@ FamixF77ExternalDeclaration class >> annotation [
 	<generated>
 	^ self
 ]
+
+{ #category : #accessing }
+FamixF77ExternalDeclaration >> programUnit [
+	"Relation named: #programUnit type: #FamixF77ProgramUnit opposite: #externalDeclarations"
+
+	<generated>
+	<container>
+	^ programUnit
+]
+
+{ #category : #accessing }
+FamixF77ExternalDeclaration >> programUnit: anObject [
+
+	<generated>
+	programUnit := anObject
+]
+
+{ #category : #navigation }
+FamixF77ExternalDeclaration >> programUnitGroup [
+	<generated>
+	<navigation: 'ProgramUnit'>
+	^ MooseSpecializedGroup with: self programUnit
+]
diff --git a/src/Famix-Fortran77-Entities/FamixF77ProgramUnit.class.st b/src/Famix-Fortran77-Entities/FamixF77ProgramUnit.class.st
index 3fc6822..8f21e68 100644
--- a/src/Famix-Fortran77-Entities/FamixF77ProgramUnit.class.st
+++ b/src/Famix-Fortran77-Entities/FamixF77ProgramUnit.class.st
@@ -7,6 +7,7 @@ Class {
 	#traits : 'FamixTSourceEntity + FamixTWithComments + TEntityMetaLevelDependency',
 	#classTraits : 'FamixTSourceEntity classTrait + FamixTWithComments classTrait + TEntityMetaLevelDependency classTrait',
 	#instVars : [
+		'#externalDeclarations => FMMany type: #FamixF77ExternalDeclaration opposite: #programUnit',
 		'#includes => FMMany type: #FamixF77Include opposite: #includedBy',
 		'#programFile => FMOne type: #FamixF77ProgramFile opposite: #programUnits'
 	],
@@ -30,6 +31,12 @@ FamixF77ProgramUnit class >> isAbstract [
 	^ self == FamixF77ProgramUnit
 ]
 
+{ #category : #adding }
+FamixF77ProgramUnit >> addExternalDeclaration: anObject [
+	<generated>
+	^ self externalDeclarations add: anObject
+]
+
 { #category : #adding }
 FamixF77ProgramUnit >> addInclude: anObject [
 	<generated>
@@ -51,6 +58,29 @@ FamixF77ProgramUnit >> dicImplicit [
 	^ self attributeAt: #dicImplicit ifAbsentPut: [ self defaultImplicit ]
 ]
 
+{ #category : #accessing }
+FamixF77ProgramUnit >> externalDeclarations [
+	"Relation named: #externalDeclarations type: #FamixF77ExternalDeclaration opposite: #programUnit"
+
+	<generated>
+	<derived>
+	^ externalDeclarations
+]
+
+{ #category : #accessing }
+FamixF77ProgramUnit >> externalDeclarations: anObject [
+
+	<generated>
+	externalDeclarations value: anObject
+]
+
+{ #category : #navigation }
+FamixF77ProgramUnit >> externalDeclarationsGroup [
+	<generated>
+	<navigation: 'ExternalDeclarations'>
+	^ MooseSpecializedGroup withAll: self externalDeclarations asSet
+]
+
 { #category : #testing }
 FamixF77ProgramUnit >> implicits [
 
diff --git a/src/Famix-Fortran77-Generator/FamixFortran77Generator.class.st b/src/Famix-Fortran77-Generator/FamixFortran77Generator.class.st
index 8a101b3..447c33c 100644
--- a/src/Famix-Fortran77-Generator/FamixFortran77Generator.class.st
+++ b/src/Famix-Fortran77-Generator/FamixFortran77Generator.class.st
@@ -195,6 +195,7 @@ FamixFortran77Generator >> defineHierarchy [
 	complex --|> typeIntrinsic."
 	
 	externalDeclaration --|> namedEntity.
+	externalDeclaration --|> #TSourceEntity.
 
 	indexedFileAnchor --|> sourceAnchor.
 	indexedFileAnchor --|> #TFileNavigation.
@@ -311,6 +312,7 @@ FamixFortran77Generator >> defineRelations [
 	super defineRelations.
 
 	programFile <>-* programUnit.
+	programUnit <>-* externalDeclaration.
 
 	((include property: #included)
 		 comment: 'File included';