diff --git a/ptxboa/data/dim_process.csv b/ptxboa/data/dim_process.csv
index b02f5810..b5b67802 100644
--- a/ptxboa/data/dim_process.csv
+++ b/ptxboa/data/dim_process.csv
@@ -21,8 +21,8 @@ Green iron reduction,DRI,DRI-S,H2-G,True,False,False,False,PROC,False,False,Fals
 Green iron ship,DRI-S,DRI-S,DRI-S,False,False,True,False,TRANSP-S,False,True,False,False,ProcessTransportShip,Transportation (Ship)
 Green iron ship (bunker fuel consumption),DRI-SB,DRI-S,DRI-S,False,False,True,False,TRANSP-S,False,False,False,False,ProcessTransportShip,Transportation (Ship),BFUEL-L
 FT e-fuels Synthesis (Fischer-Tropsch),EFUELSYN,CHX-L,H2-G,True,False,False,False,PROC,False,False,False,True,ProcessDerivate,Derivate production,H2O-L/CO2-G/EL/HEAT/N2-G
-electricity storage,EL-STR,EL,EL,False,False,True,False,PROC,False,True,False,False,ProcessDerivate,Derivate production,H2O-L/CO2-G/EL/HEAT/N2-G
-electricity transmission,EL-TRANS,EL,EL,False,False,True,False,TRANSP,False,True,False,False,ProcessPassthrough
+electricity storage,EL-STR,EL,EL,False,False,True,False,PROC,False,True,False,False,ProcessDerivate,Electrolysis,H2O-L/CO2-G/EL/HEAT/N2-G
+electricity transmission,EL-TRANS,EL,EL,False,False,True,False,TRANSP,False,True,False,False,ProcessPassthrough,Electrolysis
 Hydrogen compression,H2-COMP,H2-G,H2-G,True,False,True,False,TRANSP-P,False,False,False,False,ProcessTransportPrePost,Transportation (Pipeline),HEAT/EL
 Hydrogen Liquification,H2-LIQ,H2-L,H2-G,True,False,True,False,TRANSP-S,False,False,False,False,ProcessTransportPrePost,Transportation (Ship),HEAT/EL
 Hydrogen land pipeline new,H2-P-L,H2-G,H2-G,False,False,True,False,TRANSP-P,False,False,False,False,ProcessTransportPipeline,Transportation (Pipeline)
@@ -37,7 +37,7 @@ LOHC conversion,LOHC-CON,LOHC-L,H2-G,True,False,True,False,TRANSP-S,False,False,
 LOHC reconversion,LOHC-REC,H2-G,LOHC-L,True,False,True,False,TRANSP-S,False,False,False,False,ProcessTransportPrePost,Transportation (Ship),HEAT/EL
 LOHC ship (own fuel consumption),LOHC-S,LOHC-L,LOHC-L,False,False,True,False,TRANSP-S,False,False,False,False,ProcessTransportShip,Transportation (Ship)
 LOHC ship (bunker fuel consumption),LOHC-SB,LOHC-L,LOHC-L,False,False,True,False,TRANSP-S,False,False,False,False,ProcessTransportShip,Transportation (Ship),BFUEL-L
-Ammonia reconversion,NH3-REC,H2-G,NH3-L,True,False,True,False,TRANSP,False,False,False,False,ProcessPassthrough
+Ammonia reconversion,NH3-REC,H2-G,NH3-L,True,False,True,False,TRANSP,False,False,False,False,ProcessPassthrough,Transportation (Ship)
 Ammonia ship (own fuel consumption),NH3-S,NH3-L,NH3-L,False,False,True,False,TRANSP-S,False,False,False,False,ProcessTransportShip,Transportation (Ship)
 Ammonia ship (bunker fuel consumption),NH3-SB,NH3-L,NH3-L,False,False,True,False,TRANSP-S,False,False,False,False,ProcessTransportShip,Transportation (Ship),BFUEL-L
 Ammonia Synthesis (Haber-Bosch),NH3SYN,NH3-L,H2-G,True,False,False,False,PROC,False,False,False,True,ProcessDerivate,Derivate production,H2O-L/CO2-G/EL/HEAT/N2-G
diff --git a/tests/test_api.py b/tests/test_api.py
index 8278db22..36547fde 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -46,6 +46,24 @@ def _test_api_call(self, settings):
 
         return res
 
+    def test_issue_145_undefined_cost_category(self):
+        """See https://github.com/agoenergy/ptx-boa/issues/145."""
+        settings = {
+            "region": "United Arab Emirates",
+            "country": "Germany",
+            "chain": "Ammonia (AEL) + reconv. to H2",
+            "res_gen": "PV tilted",
+            "scenario": "2040 (medium)",
+            "secproc_co2": "Direct Air Capture",
+            "secproc_water": "Sea Water desalination",
+            "transport": "Ship",
+            "ship_own_fuel": False,
+            "output_unit": "USD/t",
+        }
+        res = self._test_api_call(settings)
+        level_cost_category = res.index.levels[0]
+        self.assertFalse("" in level_cost_category, "empty value in cost_category")
+
     def test_example_api_call_1_ship(self):
         """Test output structure of api.calculate()."""
         settings = {