diff --git a/src/app/app.module.ts b/src/app/app.module.ts
index 2c095d0..0de963f 100644
--- a/src/app/app.module.ts
+++ b/src/app/app.module.ts
@@ -43,7 +43,7 @@ import {
   MatColumnDef,
   MatHeaderCell,
   MatHeaderCellDef,
-  MatHeaderRow, MatHeaderRowDef, MatRow, MatRowDef,
+  MatHeaderRow, MatHeaderRowDef, MatNoDataRow, MatRow, MatRowDef,
   MatTable
 } from "@angular/material/table";
 import {MatCheckbox} from "@angular/material/checkbox";
@@ -60,6 +60,8 @@ import {
 import {
   ProductStateEditorComponent
 } from "./editor/gamesystem-editor/state-editor/product-state-editor/product-state-editor.component";
+import {MatTooltip} from "@angular/material/tooltip";
+import {MatCard, MatCardContent} from "@angular/material/card";
 
 // AoT requires an exported function for factories
 const httpLoaderFactory = (http: HttpClient): TranslateHttpLoader =>  new TranslateHttpLoader(http, './assets/i18n/', '.json');
@@ -133,7 +135,11 @@ const httpLoaderFactory = (http: HttpClient): TranslateHttpLoader =>  new Transl
     MatCheckbox,
     MatSelect,
     MatOption,
-    MatHint
+    MatHint,
+    MatTooltip,
+    MatCardContent,
+    MatCard,
+    MatNoDataRow
   ],
   providers: [],
   bootstrap: [AppComponent]
diff --git a/src/app/editor/gamesystem-editor/transition-editor/product-transition-editor/product-transition-editor.component.ts b/src/app/editor/gamesystem-editor/transition-editor/product-transition-editor/product-transition-editor.component.ts
index 79c485a..8a22044 100644
--- a/src/app/editor/gamesystem-editor/transition-editor/product-transition-editor/product-transition-editor.component.ts
+++ b/src/app/editor/gamesystem-editor/transition-editor/product-transition-editor/product-transition-editor.component.ts
@@ -2,23 +2,11 @@ import {Component, EventEmitter, Input, OnInit, Output} from '@angular/core';
 import {ProductGamesystem} from "../../../../game-model/gamesystems/ProductGamesystem";
 import {SimpleGamesystem} from "../../../../game-model/gamesystems/SimpleGamesystem";
 import {
-  MatCell, MatCellDef,
-  MatColumnDef,
-  MatHeaderCell,
-  MatHeaderCellDef, MatHeaderRow, MatHeaderRowDef, MatNoDataRow, MatRow, MatRowDef,
-  MatTable,
   MatTableDataSource
 } from "@angular/material/table";
 import {LeafGamesystemCalculator} from "../../product-gamesystem-editor/LeafGamesystemCalculator";
-import {NgForOf, NgIf} from "@angular/common";
 import {ProductTransition} from "../../../../game-model/gamesystems/ProductTransition";
 import {ProductState} from "../../../../game-model/gamesystems/ProductState";
-import {MatTooltip} from "@angular/material/tooltip";
-import {MatFormField} from "@angular/material/form-field";
-import {MatInput} from "@angular/material/input";
-import {Transition} from "../../../../game-model/gamesystems/Transition";
-import {MatCard, MatCardContent, MatCardTitle} from "@angular/material/card";
-
 class DisplayedColumnName {
   displayedName: string
   internalName: string