Changed scope column name to scope_id in table account_classes.

database/migrations/2018_09_07_090452_create_account_classes_table.php

@@ -28,8 +28,8 @@ class CreateAccountClassesTable extends Migration
                   ->onDelete('no action');
             
             // The scope of the account class.
-            $table->integer('scope')->unsigned();
+            $table->integer('scope_id')->unsigned();
-            $table->foreign('scope')->references('id')->on('scopes')
+            $table->foreign('scope_id')->references('id')->on('scopes')
                   ->onDelete('no action');
 
             $table->timestamps();