diff --git a/.github/workflows/pr_check.yml b/.github/workflows/pr_check.yml
index 70e6fa4..ac420da 100644
--- a/.github/workflows/pr_check.yml
+++ b/.github/workflows/pr_check.yml
@@ -15,7 +15,7 @@ jobs:
   analyze_and_test:
     name: Analyze & test
     runs-on: macos-11
-    timeout-minutes: 10
+    timeout-minutes: 5
     steps:
       - uses: actions/checkout@v3
         with:
@@ -47,3 +47,10 @@ jobs:
 
       - name: Run tests
         run: flutter test
+
+      - name: Analyze project source with stub
+        if: ${{ github.event.pull_request.head.repo.full_name == github.repository }}
+        run: |
+          bash ./.github/scripts/stub_iap.sh
+          flutter pub get
+          flutter analyze lib --fatal-infos
diff --git a/iap/lib/m3_lightmeter_iap.dart b/iap/lib/m3_lightmeter_iap.dart
index 2f5d26b..171fe47 100644
--- a/iap/lib/m3_lightmeter_iap.dart
+++ b/iap/lib/m3_lightmeter_iap.dart
@@ -8,6 +8,7 @@ import 'package:m3_lightmeter_iap/src/providers/iap_products_provider.dart';
 export 'src/data/models/iap_product.dart';
 
 export 'src/providers/equipment_profile_provider.dart';
+export 'src/providers/films_provider.dart';
 export 'src/providers/iap_products_provider.dart';
 
 class IAPProviders extends StatelessWidget {
diff --git a/iap/lib/src/providers/films_provider.dart b/iap/lib/src/providers/films_provider.dart
index 461af39..e75ccd3 100644
--- a/iap/lib/src/providers/films_provider.dart
+++ b/iap/lib/src/providers/films_provider.dart
@@ -23,6 +23,7 @@ class FilmsProviderState extends State<FilmsProvider> {
   Widget build(BuildContext context) {
     return Films(
       values: const [Film.other()],
+      filmsInUse: const [Film.other()],
       selected: const Film.other(),
       child: widget.child,
     );
@@ -34,15 +35,28 @@ class FilmsProviderState extends State<FilmsProvider> {
 }
 
 class Films extends SelectableInheritedModel<Film> {
+  final List<Film> filmsInUse;
+
   const Films({
     super.key,
     required super.values,
+    required this.filmsInUse,
     required super.selected,
     required super.child,
   });
 
+  /// [Film.other()] + all the custom fields with actual reciprocity formulas
   static List<Film> of(BuildContext context) {
-    return InheritedModel.inheritFrom<Films>(context, aspect: SelectableAspect.list)!.values;
+    return InheritedModel.inheritFrom<Films>(context)!.values;
+  }
+
+  /// [Film.other()] + films in use selected by user
+  static List<Film> inUseOf<T>(BuildContext context) {
+    return InheritedModel.inheritFrom<Films>(
+      context,
+      aspect: SelectableAspect.list,
+    )!
+        .filmsInUse;
   }
 
   static Film selectedOf(BuildContext context) {
diff --git a/iap/lib/src/providers/selectable_provider.dart b/iap/lib/src/providers/selectable_provider.dart
index c4168d3..c18f998 100644
--- a/iap/lib/src/providers/selectable_provider.dart
+++ b/iap/lib/src/providers/selectable_provider.dart
@@ -13,22 +13,6 @@ class SelectableInheritedModel<T> extends InheritedModel<SelectableAspect> {
   final List<T> values;
   final T selected;
 
-  static List<T> of<T>(BuildContext context) {
-    return InheritedModel.inheritFrom<SelectableInheritedModel<T>>(
-      context,
-      aspect: SelectableAspect.list,
-    )!
-        .values;
-  }
-
-  static T selectedOf<T>(BuildContext context) {
-    return InheritedModel.inheritFrom<SelectableInheritedModel>(
-      context,
-      aspect: SelectableAspect.selected,
-    )!
-        .selected;
-  }
-
   @override
   bool updateShouldNotify(SelectableInheritedModel oldWidget) => true;