diff --git a/schema/revert/application_validation_functions/emission_category_missing_fuel.sql b/schema/revert/application_validation_functions/emission_category_missing_fuel.sql
index 961adb3e7a..b84d71c89e 100644
--- a/schema/revert/application_validation_functions/emission_category_missing_fuel.sql
+++ b/schema/revert/application_validation_functions/emission_category_missing_fuel.sql
@@ -2,6 +2,29 @@
 
 begin;
 
-drop function ggircs_portal.emission_category_missing_fuel;
+create or replace function ggircs_portal.emission_category_missing_fuel(app_revision ggircs_portal.application_revision)
+  returns boolean
+  as $$
+
+  with emissions as (
+    select distinct(source_type_name) as reported_via_emission
+    from ggircs_portal.application_revision_emission_form_data(app_revision) ed
+    where ed.annual_co2e > 0
+  ),
+  fuel_data as (
+    select * from ggircs_portal.application_revision_fuel_form_data(app_revision)
+  ),
+  fuels as (
+    select distinct(display_name) as reported_via_fuel from ggircs_portal.emission_category ec
+    join fuel_data
+      on fuel_data.emission_category_id = ec.id
+      and fuel_data.quantity > 0
+  ) select (select count(*) from emissions where reported_via_emission not in (select reported_via_fuel from fuels)) = 0;
+
+$$ language sql stable;
+
+grant execute on function ggircs_portal.emission_category_missing_fuel to ciip_administrator, ciip_analyst, ciip_industry_user;
+
+comment on function ggircs_portal.emission_category_missing_fuel(ggircs_portal.application_revision) is 'This validation function for a CIIP (CleanBC Industrial Incentive Program) application determines if any emission categories have emissions reported in a category, but no corresponding fuels reported for that category';
 
 commit;