diff --git a/data_adapter_oemof/adapters.py b/data_adapter_oemof/adapters.py
index bf00d21..7b2b6da 100644
--- a/data_adapter_oemof/adapters.py
+++ b/data_adapter_oemof/adapters.py
@@ -416,6 +416,27 @@ def get_default_parameters(
         defaults.update({"name": self.process_name})
         return defaults
 
+    def create_bev_share_constraint(self
+                                    ):
+        df = pd.DataFrame(
+            {'name': [f'{self.process_name}_{year}' for year in self.data['year']],
+             'type': self.process_name,
+             'year': self.data['year'],
+             'label': self.type,
+             'share_mob_flex_G2V': self.data['share_tra_flex_g2v'][0] if len(
+                 self.data['share_tra_flex_g2v']) == 1 else self.data[
+                 'share_tra_flex_g2v'],  # if-structure necessary because single value is contained in a list.
+             'share_mob_flex_V2G': self.data['share_tra_flex_v2g'][0] if len(
+                 self.data['share_tra_flex_v2g']) == 1 else self.data[
+                 'share_tra_flex_v2g'],
+             'share_mob_inflex': self.data['share_tra_inflex'][0]if len(
+                 self.data['share_tra_inflex']) == 1 else self.data[
+                 'share_tra_inflex'],
+             }
+        )
+        # todo: save df to csv or find function to do so.
+        return
+
 
 class TransportConversionAdapter(Adapter):
     """
diff --git a/data_adapter_oemof/build_datapackage.py b/data_adapter_oemof/build_datapackage.py
index c74906f..46158ba 100644
--- a/data_adapter_oemof/build_datapackage.py
+++ b/data_adapter_oemof/build_datapackage.py
@@ -12,6 +12,7 @@
 from data_adapter_oemof.adapters import Adapter as FacadeAdapter
 from data_adapter_oemof.settings import BUS_MAP, PARAMETER_MAP, PROCESS_ADAPTER_MAP
 from data_adapter_oemof.utils import convert_mixed_types_to_same_length
+from data_adapter_oemof.adapters import BevFleetAdapter
 
 
 # Define a function to aggregate differing values into a list
@@ -511,6 +512,8 @@ def build_datapackage(
                     parameter_map=parameter_map,
                     bus_map=bus_map,
                 )
+                if component_adapter.type == 'bev_fleet':
+                    component_adapter.create_bev_share_constraint()
                 components.append(component_adapter.facade_dict)
                 # Fill with all buses occurring, needed for foreign keys as well!
                 process_busses += list(component_adapter.get_busses().values())