diff --git a/src/actinia_module_plugin/core/modules/actinia_common.py b/src/actinia_module_plugin/core/modules/actinia_common.py
index 02fa330..d912d0f 100644
--- a/src/actinia_module_plugin/core/modules/actinia_common.py
+++ b/src/actinia_module_plugin/core/modules/actinia_common.py
@@ -333,6 +333,8 @@ def populate_vm_params_and_returns(self, gm, pc):
                             "import_descr_" + param,
                             pc.import_descr_dict,
                         )
+                        if temp_dict.get("schema"):
+                            temp_dict["schema"]["subtype"] = "datasource"
                         self.vm_params.append(temp_dict)
 
         if "exporter" in gm:
diff --git a/tests/resources/actinia_modules/nested_modules_test.json b/tests/resources/actinia_modules/nested_modules_test.json
index 87aa201..9967a6c 100644
--- a/tests/resources/actinia_modules/nested_modules_test.json
+++ b/tests/resources/actinia_modules/nested_modules_test.json
@@ -38,7 +38,8 @@
 		"name": "url_to_geojson_point",
 		"optional": true,
 		"schema": {
-			"type": "string"
+			"type": "string",
+			"subtype": "datasource"
 		}
 	}, {
 		"description": "Name for output slope raster map.  [generated from r.slope.aspect_slope]",
diff --git a/tests/resources/actinia_modules/point_in_polygon.json b/tests/resources/actinia_modules/point_in_polygon.json
index 00daca0..4e8d1fc 100644
--- a/tests/resources/actinia_modules/point_in_polygon.json
+++ b/tests/resources/actinia_modules/point_in_polygon.json
@@ -10,7 +10,8 @@
       "name": "url_to_geojson_point",
       "optional": true,
       "schema": {
-        "type": "string"
+        "type": "string",
+        "subtype": "datasource"
       }
     }
   ],
diff --git a/tests/resources/actinia_modules/point_in_polygon_with_export.json b/tests/resources/actinia_modules/point_in_polygon_with_export.json
index f4565ef..47c81d0 100644
--- a/tests/resources/actinia_modules/point_in_polygon_with_export.json
+++ b/tests/resources/actinia_modules/point_in_polygon_with_export.json
@@ -11,7 +11,8 @@
       "name": "url_to_geojson_point",
       "optional": true,
       "schema": {
-        "type": "string"
+        "type": "string",
+        "subtype": "datasource"
       }
     }
   ],