diff --git a/capella_ros_tools/importer.py b/capella_ros_tools/importer.py
index b110f3f..2345030 100644
--- a/capella_ros_tools/importer.py
+++ b/capella_ros_tools/importer.py
@@ -111,6 +111,7 @@ def _convert_class(
             prop_yml = {
                 "name": field_def.name,
                 "type": decl.Promise(promise_ref),
+                "kind": "COMPOSITION",
                 "description": field_def.description,
                 "min_card": decl.NewObject(
                     "LiteralNumericValue", value=field_def.type.card.min
diff --git a/tests/data/data_model/example_msgs.yaml b/tests/data/data_model/example_msgs.yaml
index 61c9778..d297411 100644
--- a/tests/data/data_model/example_msgs.yaml
+++ b/tests/data/data_model/example_msgs.yaml
@@ -18,6 +18,7 @@
                               - name: sample_field1
                                 description: "This block comment is added to the property description of sample_field1. This block comment is also added to the property description of sample_field1. "
                                 type: !promise package1.uint8
+                                kind: COMPOSITION
                                 min_card: !new_object
                                     _type: LiteralNumericValue
                                     value: "1"
@@ -33,6 +34,7 @@
                               - name: sample_field2
                                 description: "This block comment is added to the property descriptions of sample_field2 and sample_field3. "
                                 type: !promise package1.uint8
+                                kind: COMPOSITION
                                 min_card: !new_object
                                     _type: LiteralNumericValue
                                     value: "1"
@@ -42,6 +44,7 @@
                               - name: sample_field3
                                 description: "This block comment is added to the property descriptions of sample_field2 and sample_field3. "
                                 type: !promise package1.uint8
+                                kind: COMPOSITION
                                 min_card: !new_object
                                     _type: LiteralNumericValue
                                     value: "0"
@@ -51,6 +54,7 @@
                               - name: sample_field4
                                 description: "This block comment is added to the property descriptions of sample_field4 and sample_field5. Fields in SampleClass can reference enums in other files. The property sample_field4 is of type SampleEnum. cf. SampleEnum "
                                 type: !promise types.SampleEnum
+                                kind: COMPOSITION
                                 min_card: !new_object
                                     _type: LiteralNumericValue
                                     value: "1"
@@ -60,6 +64,7 @@
                               - name: sample_field5
                                 description: "This block comment is added to the property descriptions of sample_field4 and sample_field5. This inline comment is added to the property description of sample_field5. The property sample_field5 is of type SampleEnumValue. cf. SampleEnum, SAMPLE_ENUM_VALUE_XXX "
                                 type: !promise types.SampleEnumValue
+                                kind: COMPOSITION
                                 min_card: !new_object
                                     _type: LiteralNumericValue
                                     value: "1"
@@ -133,6 +138,7 @@
                               - name: status
                                 description: "The property status is of type SampleClassEnumStatus. "
                                 type: !promise types.SampleClassEnumStatus
+                                kind: COMPOSITION
                                 min_card: !new_object
                                     _type: LiteralNumericValue
                                     value: "1"
@@ -142,6 +148,7 @@
                               - name: color
                                 description: "The property color is of type Color. "
                                 type: !promise types.Color
+                                kind: COMPOSITION
                                 min_card: !new_object
                                     _type: LiteralNumericValue
                                     value: "1"
@@ -151,6 +158,7 @@
                               - name: field
                                 description: ""
                                 type: !promise package2.uint8
+                                kind: COMPOSITION
                                 min_card: !new_object
                                     _type: LiteralNumericValue
                                     value: "1"
diff --git a/tests/test_import_msgs.py b/tests/test_import_msgs.py
index 16d98a7..67d1f4b 100644
--- a/tests/test_import_msgs.py
+++ b/tests/test_import_msgs.py
@@ -83,6 +83,7 @@ def class_expected():
                 {
                     "name": "field",
                     "type": decl.Promise("my_package.uint8"),
+                    "kind": "COMPOSITION",
                     "description": "Field",
                     "min_card": decl.NewObject(
                         "LiteralNumericValue", value="1"
@@ -178,6 +179,7 @@ def test_convert_class_with_range(importer):
                 {
                     "name": "field",
                     "type": decl.Promise("my_package.uint8"),
+                    "kind": "COMPOSITION",
                     "description": "Field",
                     "min_card": decl.NewObject(
                         "LiteralNumericValue", value="1"
@@ -229,6 +231,7 @@ def test_convert_class_with_ref(importer):
                 {
                     "name": "field",
                     "type": decl.Promise("std_msgs.uint8"),
+                    "kind": "COMPOSITION",
                     "description": "Field",
                     "min_card": decl.NewObject(
                         "LiteralNumericValue", value="1"