diff --git a/bw_processing/datapackage.py b/bw_processing/datapackage.py
index 40d65e2..ad1c3f5 100644
--- a/bw_processing/datapackage.py
+++ b/bw_processing/datapackage.py
@@ -114,7 +114,7 @@ def get_resource(self, name_or_index: Union[str, int]) -> (Any, dict):
                 obj = self.data[index]()
                 self.data[index] = obj
 
-            self._cache[name_or_index] = self.data[index], self.resources[index]
+            self._cache[name_or_index] = (self.data[index], self.resources[index])
         return self._cache[name_or_index]
 
     def filter_by_attribute(self, key: str, value: Any) -> "FilteredDatapackage":
@@ -604,8 +604,6 @@ def add_dynamic_array(
         )
         name = self._prepare_name(name)
 
-        # Do something with dynamic vector
-
         self._add_numpy_array_resource(
             array=load_bytes(indices_array),
             name=name + ".indices",
@@ -622,6 +620,16 @@ def add_dynamic_array(
                 **kwargs,
             )
 
+        self.data.append(interface)
+        resource = {
+            "profile": "interface",
+            "name": name + ".data",
+            "group": name,
+            "kind": "data",
+        }
+        resource.update(**kwargs)
+        self.resources.append(resource)
+
     def add_csv_metadata(
         self, *, dataframe: pd.DataFrame, valid_for: list, name: str = None, **kwargs
     ) -> None:
diff --git a/tests/fixtures/test-fixture.zip b/tests/fixtures/test-fixture.zip
index af7f892..c2d751c 100644
Binary files a/tests/fixtures/test-fixture.zip and b/tests/fixtures/test-fixture.zip differ
diff --git a/tests/fixtures/tfd/datapackage.json b/tests/fixtures/tfd/datapackage.json
index c8caf0c..2921d47 100644
--- a/tests/fixtures/tfd/datapackage.json
+++ b/tests/fixtures/tfd/datapackage.json
@@ -167,6 +167,15 @@
       "category": "array",
       "nrows": 3
     },
+    {
+      "profile": "interface",
+      "name": "sa-array-interface.data",
+      "group": "sa-array-interface",
+      "kind": "data",
+      "matrix": "sa_matrix",
+      "category": "array",
+      "nrows": 3
+    },
     {
       "profile": "data-resource",
       "mediatype": "text/csv",
@@ -194,7 +203,7 @@
       "valid_for": "sa-data-array"
     }
   ],
-  "created": "2021-02-03T12:36:32.895174Z",
+  "created": "2021-02-03T13:03:15.461858Z",
   "combinatorial": false,
   "sequential": false,
   "seed": null,
diff --git a/tests/integration.py b/tests/integration.py
index 8901227..aa8377b 100644
--- a/tests/integration.py
+++ b/tests/integration.py
@@ -107,7 +107,7 @@ def add_data(dp):
 
 
 def check_data(dp):
-    assert len(dp.resources) == len(dp.data) == 16
+    assert len(dp.resources) == len(dp.data) == 17
     d, _ = dp.get_resource("sa-data-array-json-parameters")
     assert d == ["a", "foo"]
 
@@ -284,6 +284,15 @@ def check_metadata(dp, as_tuples=True):
             "path": "sa-array-interface.indices.npy",
             "group": "sa-array-interface",
         },
+        {
+            "category": "array",
+            "group": "sa-array-interface",
+            "kind": "data",
+            "matrix": "sa_matrix",
+            "name": "sa-array-interface.data",
+            "nrows": 3,
+            "profile": "interface",
+        },
         {
             "profile": "data-resource",
             "mediatype": "text/csv",
@@ -307,7 +316,7 @@ def check_metadata(dp, as_tuples=True):
         },
     ]
     expected_as_list = deepcopy(expected)
-    expected_as_list[13]["valid_for"][0] = list(expected_as_list[13]["valid_for"][0])
+    expected_as_list[14]["valid_for"][0] = list(expected_as_list[14]["valid_for"][0])
     if as_tuples:
         assert dp.metadata["resources"] == expected
     else: