diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 32c5a14e..730886f1 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -5,7 +5,7 @@ modelix-model-api-gen = { id = "org.modelix.model-api-gen", version.ref = "model
 npm-publish = { id = "dev.petuska.npm.publish", version = "3.5.2" }
 
 [versions]
-modelixCore = "11.2.1"
+modelixCore = "11.3.0"
 kotlinCoroutines="1.10.1"
 ktor="3.0.3"
 
diff --git a/mps-sync-plugin-lib/src/main/kotlin/org/modelix/mps/sync/modelix/util/INodeExt.kt b/mps-sync-plugin-lib/src/main/kotlin/org/modelix/mps/sync/modelix/util/INodeExt.kt
index fd06ec61..fe03f985 100644
--- a/mps-sync-plugin-lib/src/main/kotlin/org/modelix/mps/sync/modelix/util/INodeExt.kt
+++ b/mps-sync-plugin-lib/src/main/kotlin/org/modelix/mps/sync/modelix/util/INodeExt.kt
@@ -24,20 +24,23 @@ import org.modelix.model.api.BuiltinLanguages
 import org.modelix.model.api.INode
 import org.modelix.model.api.PNodeAdapter
 import org.modelix.model.api.isSubConceptOf
-import org.modelix.model.mpsadapters.MPSNode
+import org.modelix.model.mpsadapters.MPSWritableNode
 
 @UnstableModelixFeature(reason = "The new modelix MPS plugin is under construction", intendedFinalization = "This feature is finalized when the new sync plugin is ready for release.")
-fun INode.nodeIdAsLong(): Long =
-    when (this) {
-        is PNodeAdapter -> this.nodeId
-        is MPSNode -> {
-            val nodeId = this.node.nodeId
+fun INode.nodeIdAsLong(): Long {
+    val node = this
+    val writableNode = this.asWritableNode()
+    return when {
+        node is PNodeAdapter -> node.nodeId
+        writableNode is MPSWritableNode -> {
+            val nodeId = writableNode.node.nodeId
             check(nodeId is Regular) { "Unsupported NodeId format: $nodeId" }
             nodeId.id
         }
 
         else -> throw IllegalStateException("Unsupported INode implementation")
     }
+}
 
 @UnstableModelixFeature(reason = "The new modelix MPS plugin is under construction", intendedFinalization = "This feature is finalized when the new sync plugin is ready for release.")
 fun INode.isModule(): Boolean {
diff --git a/mps-sync-plugin-lib/src/main/kotlin/org/modelix/mps/sync/mps/factories/SNodeFactory.kt b/mps-sync-plugin-lib/src/main/kotlin/org/modelix/mps/sync/mps/factories/SNodeFactory.kt
index 1a8b0848..3c1e0176 100644
--- a/mps-sync-plugin-lib/src/main/kotlin/org/modelix/mps/sync/mps/factories/SNodeFactory.kt
+++ b/mps-sync-plugin-lib/src/main/kotlin/org/modelix/mps/sync/mps/factories/SNodeFactory.kt
@@ -32,9 +32,9 @@ import org.modelix.model.api.PNodeReference
 import org.modelix.model.api.getNode
 import org.modelix.model.mpsadapters.MPSArea
 import org.modelix.model.mpsadapters.MPSLanguageRepository
-import org.modelix.model.mpsadapters.MPSNode
 import org.modelix.model.mpsadapters.MPSProperty
 import org.modelix.model.mpsadapters.MPSReferenceLink
+import org.modelix.model.mpsadapters.MPSWritableNode
 import org.modelix.mps.sync.modelix.util.getMpsNodeId
 import org.modelix.mps.sync.modelix.util.nodeIdAsLong
 import org.modelix.mps.sync.mps.services.ServiceLocator
@@ -151,7 +151,7 @@ class SNodeFactory(
             } else {
                 // target node is an existing SNode
                 val area = MPSArea(mpsRepository)
-                val mpsNode = area.resolveNode(targetNodeReference) as MPSNode?
+                val mpsNode = area.resolveNode(targetNodeReference)?.asWritableNode() as MPSWritableNode?
                 requireNotNull(mpsNode) { "SNode identified by Node $sourceNodeId is not found." }
                 source.setReferenceTarget(reference, mpsNode.node)
             }
diff --git a/mps-sync-plugin-lib/src/main/kotlin/org/modelix/mps/sync/transformation/cache/MpsToModelixMapInitializerVisitor.kt b/mps-sync-plugin-lib/src/main/kotlin/org/modelix/mps/sync/transformation/cache/MpsToModelixMapInitializerVisitor.kt
index 07ae5f99..7bd5e76d 100644
--- a/mps-sync-plugin-lib/src/main/kotlin/org/modelix/mps/sync/transformation/cache/MpsToModelixMapInitializerVisitor.kt
+++ b/mps-sync-plugin-lib/src/main/kotlin/org/modelix/mps/sync/transformation/cache/MpsToModelixMapInitializerVisitor.kt
@@ -143,7 +143,7 @@ class MpsToModelixMapInitializerVisitor(
             Pair(modelId, modelName)
         } else {
             // target is an SModel in MPS
-            val modelixModelImport = MPSArea(repository).resolveNode(targetModelRef) as MPSModelImportAsNode?
+            val modelixModelImport = MPSArea(repository).resolveNode(targetModelRef)?.asWritableNode() as MPSModelImportAsNode?
             requireNotNull(modelixModelImport) { "Model Import identified by Node $modelImport is not found." }
             val targetModel = modelixModelImport.importedModel
             val modelId = targetModel.modelId
diff --git a/mps-sync-plugin-lib/src/main/kotlin/org/modelix/mps/sync/transformation/modelixToMps/incremental/ModelixTreeChangeVisitor.kt b/mps-sync-plugin-lib/src/main/kotlin/org/modelix/mps/sync/transformation/modelixToMps/incremental/ModelixTreeChangeVisitor.kt
index 6227c812..a9c1592b 100644
--- a/mps-sync-plugin-lib/src/main/kotlin/org/modelix/mps/sync/transformation/modelixToMps/incremental/ModelixTreeChangeVisitor.kt
+++ b/mps-sync-plugin-lib/src/main/kotlin/org/modelix/mps/sync/transformation/modelixToMps/incremental/ModelixTreeChangeVisitor.kt
@@ -26,7 +26,7 @@ import org.modelix.model.api.PropertyFromName
 import org.modelix.model.api.getNode
 import org.modelix.model.mpsadapters.MPSArea
 import org.modelix.model.mpsadapters.MPSLanguageRepository
-import org.modelix.model.mpsadapters.MPSNode
+import org.modelix.model.mpsadapters.MPSWritableNode
 import org.modelix.mps.sync.modelix.util.getModule
 import org.modelix.mps.sync.modelix.util.isDevKitDependency
 import org.modelix.mps.sync.modelix.util.isModel
@@ -104,7 +104,7 @@ class ModelixTreeChangeVisitor(
                         nodeMap.getNode(targetNode.nodeIdAsLong())
                     } else {
                         val area = MPSArea(mpsRepository)
-                        val mpsNode = area.resolveNode(targetNodeReference) as MPSNode?
+                        val mpsNode = area.resolveNode(targetNodeReference)?.asWritableNode() as MPSWritableNode?
                         requireNotNull(mpsNode) { "SNode identified by Node $nodeId is not found." }
                         mpsNode.node
                     }
diff --git a/mps-sync-plugin-lib/src/main/kotlin/org/modelix/mps/sync/transformation/modelixToMps/transformers/ModelTransformer.kt b/mps-sync-plugin-lib/src/main/kotlin/org/modelix/mps/sync/transformation/modelixToMps/transformers/ModelTransformer.kt
index 964d2462..f026917a 100644
--- a/mps-sync-plugin-lib/src/main/kotlin/org/modelix/mps/sync/transformation/modelixToMps/transformers/ModelTransformer.kt
+++ b/mps-sync-plugin-lib/src/main/kotlin/org/modelix/mps/sync/transformation/modelixToMps/transformers/ModelTransformer.kt
@@ -204,9 +204,9 @@ class ModelTransformer(
                 )
             } else {
                 // target is an SModel in MPS
-                val modelixModelImport = MPSArea(mpsRepository).resolveNode(targetModelRef) as MPSModelImportAsNode?
+                val modelixModelImport = MPSArea(mpsRepository).resolveNode(targetModelRef)?.asWritableNode() as MPSModelImportAsNode?
                 requireNotNull(modelixModelImport) { "Model Import identified by Node $nodeId is not found." }
-                val modelImport = modelixModelImport.importedModel.reference
+                val modelImport = modelixModelImport.importedModel
                 ModelImports(sourceModel).addModelImport(modelImport)
 
                 nodeMap.put(sourceModel, modelImport, iNode.nodeIdAsLong())