diff --git a/code/languages/org.iets3.opensource/languages/org.iets3.variability.featuremodel.base/models/org.iets3.variability.featuremodel.base.editor.mps b/code/languages/org.iets3.opensource/languages/org.iets3.variability.featuremodel.base/models/org.iets3.variability.featuremodel.base.editor.mps
index fb6b9e4859..bf6f38b846 100644
--- a/code/languages/org.iets3.opensource/languages/org.iets3.variability.featuremodel.base/models/org.iets3.variability.featuremodel.base.editor.mps
+++ b/code/languages/org.iets3.opensource/languages/org.iets3.variability.featuremodel.base/models/org.iets3.variability.featuremodel.base.editor.mps
@@ -49,9 +49,9 @@
+
-
@@ -469,6 +469,7 @@
+
@@ -5499,9 +5500,9 @@
-
-
-
+
+
+
@@ -7056,166 +7057,171 @@
-
-
-
-
-
-
+
-
-
-
-
-
-
-
-
-
+
+
+
+
+
+
+
+
-
-
-
-
-
-
+
+
+
+
-
-
+
+
-
-
-
-
+
+
+
+
+
+
+
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
+
+
+
+
+
+
+
+
+
+
+
+
-
-
+
+
+
+
+
+
+
+
+
+
-
-
-
-
-
-
+
+
+
+
+
+
+
+
+
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
-
-
-
+
+
+
+
+
+
+
+
+
+
+
-
-
-
-
+
+
+
+
-
+
-
-
+
+
-
-
-
+
+
+
-
-
-
-
-
-
+
+
+
+
+
+
-
-
+
+
-
-
-
-
-
+
+
+
+
-
-
+
+
+
-
-
-
-
+
+
+
+
@@ -9048,5 +9054,105 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/code/languages/org.iets3.opensource/solutions/org.iets3.variability.os.sandbox/models/org.iets3.variability.os.sandbox.notpresentvalue.mps b/code/languages/org.iets3.opensource/solutions/org.iets3.variability.os.sandbox/models/org.iets3.variability.os.sandbox.notpresentvalue.mps
index c99d2b0c61..bbe6791be9 100644
--- a/code/languages/org.iets3.opensource/solutions/org.iets3.variability.os.sandbox/models/org.iets3.variability.os.sandbox.notpresentvalue.mps
+++ b/code/languages/org.iets3.opensource/solutions/org.iets3.variability.os.sandbox/models/org.iets3.variability.os.sandbox.notpresentvalue.mps
@@ -30,6 +30,7 @@
+
@@ -62,6 +63,9 @@
+
+
+
@@ -134,6 +138,22 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/code/languages/org.iets3.opensource/tests/test.org.iets3.variability.featuremodel.base/models/test.org.iets3.variability.featuremodel.base.editor@tests.mps b/code/languages/org.iets3.opensource/tests/test.org.iets3.variability.featuremodel.base/models/test.org.iets3.variability.featuremodel.base.editor@tests.mps
index c9603b501b..13ef629921 100644
--- a/code/languages/org.iets3.opensource/tests/test.org.iets3.variability.featuremodel.base/models/test.org.iets3.variability.featuremodel.base.editor@tests.mps
+++ b/code/languages/org.iets3.opensource/tests/test.org.iets3.variability.featuremodel.base/models/test.org.iets3.variability.featuremodel.base.editor@tests.mps
@@ -18,6 +18,9 @@
+
+
+
@@ -35,6 +38,9 @@
+
+
+
@@ -56,6 +62,12 @@
+
+
+
+
+
+
@@ -1552,5 +1564,201 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+