diff --git a/ASN1-Model.package/ASN1AdaptiveTypeObject.class/instance/addedByDefault..st b/ASN1-Model.package/ASN1AdaptiveTypeObject.class/instance/addedByDefault..st
new file mode 100644
index 00000000..34268121
--- /dev/null
+++ b/ASN1-Model.package/ASN1AdaptiveTypeObject.class/instance/addedByDefault..st
@@ -0,0 +1,4 @@
+accessing
+addedByDefault: aKey 
+	addedByDefault ifNil: [ addedByDefault := OrderedCollection new ].
+	addedByDefault add: aKey 
\ No newline at end of file
diff --git a/ASN1-Model.package/ASN1AdaptiveTypeObject.class/instance/wasAddedByDefault..st b/ASN1-Model.package/ASN1AdaptiveTypeObject.class/instance/wasAddedByDefault..st
new file mode 100644
index 00000000..d5262f5e
--- /dev/null
+++ b/ASN1-Model.package/ASN1AdaptiveTypeObject.class/instance/wasAddedByDefault..st
@@ -0,0 +1,4 @@
+as yet unclassified
+wasAddedByDefault: aKey 
+	addedByDefault ifNil: [ ^ false ].
+	^ addedByDefault includes: aKey
\ No newline at end of file
diff --git a/ASN1-Model.package/ASN1AdaptiveTypeObject.class/properties.json b/ASN1-Model.package/ASN1AdaptiveTypeObject.class/properties.json
index 73564c0b..79e94b86 100644
--- a/ASN1-Model.package/ASN1AdaptiveTypeObject.class/properties.json
+++ b/ASN1-Model.package/ASN1AdaptiveTypeObject.class/properties.json
@@ -7,7 +7,8 @@
 	"classvars" : [ ],
 	"instvars" : [
 		"map",
-		"selfExpanding"
+		"selfExpanding",
+		"addedByDefault"
 	],
 	"name" : "ASN1AdaptiveTypeObject",
 	"type" : "normal"
diff --git a/ASN1-Model.package/ASN1BasicObject.class/instance/isAsn1.st b/ASN1-Model.package/ASN1BasicObject.class/instance/isAsn1.st
index b6294ea6..47520f9c 100644
--- a/ASN1-Model.package/ASN1BasicObject.class/instance/isAsn1.st
+++ b/ASN1-Model.package/ASN1BasicObject.class/instance/isAsn1.st
@@ -1,3 +1,3 @@
-*asn1-model
+as yet unclassified
 isAsn1
 	^ true
\ No newline at end of file
diff --git a/ASN1-Model.package/ASN1BasicObject.class/instance/isAsn1Object.st b/ASN1-Model.package/ASN1BasicObject.class/instance/isAsn1Object.st
index b3e14152..2967c353 100644
--- a/ASN1-Model.package/ASN1BasicObject.class/instance/isAsn1Object.st
+++ b/ASN1-Model.package/ASN1BasicObject.class/instance/isAsn1Object.st
@@ -1,3 +1,3 @@
-*asn1-model
+as yet unclassified
 isAsn1Object
 	^ false
\ No newline at end of file
diff --git a/ASN1-Model.package/ASN1ObjectType.class/instance/isAsn1Object.st b/ASN1-Model.package/ASN1ObjectType.class/instance/isAsn1Object.st
index 0b795e86..9de28264 100644
--- a/ASN1-Model.package/ASN1ObjectType.class/instance/isAsn1Object.st
+++ b/ASN1-Model.package/ASN1ObjectType.class/instance/isAsn1Object.st
@@ -1,3 +1,3 @@
-*asn1-model
+as yet unclassified
 isAsn1Object
 	^ true
\ No newline at end of file
diff --git a/ASN1-Model.package/monticello.meta/categories.st b/ASN1-Model.package/monticello.meta/categories.st
index 8ad30781..b684b54b 100644
--- a/ASN1-Model.package/monticello.meta/categories.st
+++ b/ASN1-Model.package/monticello.meta/categories.st
@@ -1,3 +1 @@
-SystemOrganization addCategory: #'ASN1-Model'!
-SystemOrganization addCategory: #'ASN1-Model-Exception'!
-SystemOrganization addCategory: #'ASN1-Model-Visitor'!
+self packageOrganizer ensurePackage: #'ASN1-Model' withTags: #(#Exception #Visitor)!
diff --git a/ASN1-Tool.package/ASN1ReadVisitor.class/instance/visitCollection..st b/ASN1-Tool.package/ASN1ReadVisitor.class/instance/visitCollection..st
index f7d41cf0..d51f313b 100644
--- a/ASN1-Tool.package/ASN1ReadVisitor.class/instance/visitCollection..st
+++ b/ASN1-Tool.package/ASN1ReadVisitor.class/instance/visitCollection..st
@@ -33,7 +33,8 @@ visitCollection: aCollection
 								"write the default value in the result"
 								element value defaultValue isAsn1 
 									ifTrue: [ value baseValueAt: element key put: element value defaultValue ]
-									ifFalse: [ value at: element key put: element value defaultValue ] ].
+									ifFalse: [ value at: element key put: element value defaultValue ].
+								value addedByDefault: element key ].
 							elementStream next  ]						
 						ifFalse: [ isExtended ifTrue: [ 
 							(aCollection hasElementWithTag: content tag) ifFalse: [
diff --git a/ASN1-Tool.package/ASN1WriteVisitor.class/instance/initialize.st b/ASN1-Tool.package/ASN1WriteVisitor.class/instance/initialize.st
new file mode 100644
index 00000000..5e92d404
--- /dev/null
+++ b/ASN1-Tool.package/ASN1WriteVisitor.class/instance/initialize.st
@@ -0,0 +1,4 @@
+initialization
+initialize
+	super initialize.
+	skipAddedDefaults := true
\ No newline at end of file
diff --git a/ASN1-Tool.package/ASN1WriteVisitor.class/instance/skipAddedDefaults.st b/ASN1-Tool.package/ASN1WriteVisitor.class/instance/skipAddedDefaults.st
new file mode 100644
index 00000000..1bcc26ce
--- /dev/null
+++ b/ASN1-Tool.package/ASN1WriteVisitor.class/instance/skipAddedDefaults.st
@@ -0,0 +1,3 @@
+accessing
+skipAddedDefaults 
+	skipAddedDefaults := true
\ No newline at end of file
diff --git a/ASN1-Tool.package/ASN1WriteVisitor.class/instance/visitSequenceType..st b/ASN1-Tool.package/ASN1WriteVisitor.class/instance/visitSequenceType..st
index f908492b..a6ef9afb 100644
--- a/ASN1-Tool.package/ASN1WriteVisitor.class/instance/visitSequenceType..st
+++ b/ASN1-Tool.package/ASN1WriteVisitor.class/instance/visitSequenceType..st
@@ -7,16 +7,17 @@ visitSequenceType: aSequence
 	object := currentValue "basicValue".
 	aSequence elements associations do:  [ :each |
 		(each value class = ASN1Extension) ifFalse: [   
-			(object includesKey: each key) 
-				ifTrue: [ 
-					self 
-						push: (object privAt: each key)
-						during: [ encoded elements add: (self visit: (aSequence elementAt: each key)) ]]
-				ifFalse: [
-					each value isOptional
-						ifTrue: [ each value hasDefaultValue ifTrue: [ 
-							self 
-								push: each value defaultValue 
-								during: [ encoded elements add: (self visit: (aSequence elementAt: each key) value) ] ] ]
-						ifFalse: [ self mandatoryElementNotFound ] ] ] ].
+			(skipAddedDefaults and: [ object wasAddedByDefault: each key ]) ifFalse:  [  
+				(object includesKey: each key)
+					ifTrue: [ 
+						self 
+							push: (object privAt: each key)
+							during: [ encoded elements add: (self visit: (aSequence elementAt: each key)) ]]
+					ifFalse: [
+						each value isOptional
+							ifTrue: [ each value hasDefaultValue ifTrue: [ 
+								self 
+									push: each value defaultValue 
+									during: [ encoded elements add: (self visit: (aSequence elementAt: each key) defaultValue type ) ] ] ]
+							ifFalse: [ self mandatoryElementNotFound ] ] ] ] ].
 	^ encoded
\ No newline at end of file
diff --git a/ASN1-Tool.package/ASN1WriteVisitor.class/properties.json b/ASN1-Tool.package/ASN1WriteVisitor.class/properties.json
index 6c62540d..6648c17d 100644
--- a/ASN1-Tool.package/ASN1WriteVisitor.class/properties.json
+++ b/ASN1-Tool.package/ASN1WriteVisitor.class/properties.json
@@ -6,7 +6,8 @@
 	"pools" : [ ],
 	"classvars" : [ ],
 	"instvars" : [
-		"currentValue"
+		"currentValue",
+		"skipAddedDefaults"
 	],
 	"name" : "ASN1WriteVisitor",
 	"type" : "normal"
diff --git a/ASN1-Tool.package/monticello.meta/categories.st b/ASN1-Tool.package/monticello.meta/categories.st
index 4ae1ee2b..b9c399a9 100644
--- a/ASN1-Tool.package/monticello.meta/categories.st
+++ b/ASN1-Tool.package/monticello.meta/categories.st
@@ -1,3 +1 @@
-SystemOrganization addCategory: #'ASN1-Tool'!
-SystemOrganization addCategory: 'ASN1-Tool-Exception'!
-SystemOrganization addCategory: 'ASN1-Tool-Visitor'!
+self packageOrganizer ensurePackage: #'ASN1-Tool' withTags: #(#Exception #Visitor)!