diff --git a/concept/database/database_concept.dia b/concept/database/database_concept.dia
index 82b4fa7..52a0884 100644
Binary files a/concept/database/database_concept.dia and b/concept/database/database_concept.dia differ
diff --git a/database/factories/PersonTargetFactory.php b/database/factories/PersonTargetFactory.php
index 339fcc5..732f354 100644
--- a/database/factories/PersonTargetFactory.php
+++ b/database/factories/PersonTargetFactory.php
@@ -1,9 +1,17 @@
 <?php
 
 use Faker\Generator as Faker;
+use Carbon\Carbon;
+
+use App\IOType;
 
 $factory->define(App\PersonTarget::class, function (Faker $faker) {
     return [
-        //
+        'io_type_id' => IOType::all('id')->random()->id,
+        'date' => $faker->dateTimeInInterval('2014-04-01'),
+        'amount' => $faker->randomFloat(2, 10, 2000),
+        'reference' => $faker->text(20),
+        'created_at' => Carbon::now()->format('Y-m-d H:i:s'),
+        'updated_at' => Carbon::now()->format('Y-m-d H:i:s')
     ];
 });
diff --git a/database/migrations/2018_09_07_090338_create_person_targets_table.php b/database/migrations/2018_09_07_090338_create_person_targets_table.php
index 05cce3e..4a890fe 100644
--- a/database/migrations/2018_09_07_090338_create_person_targets_table.php
+++ b/database/migrations/2018_09_07_090338_create_person_targets_table.php
@@ -31,8 +31,8 @@ class CreatePersonTargetsTable extends Migration
             // The type of the target. It can be either a payable or a
             // receivable. A payable is of type 'expediture' and a receivable is
             // of type 'income'.
-            $table->integer('io_type')->unsigned();
-            $table->foreign('io_type')->references('id')->on('i_o_types')
+            $table->integer('io_type_id')->unsigned();
+            $table->foreign('io_type_id')->references('id')->on('i_o_types')
                   ->onDelete('no action');
 
             // A reference text which describes the target
diff --git a/database/migrations/2018_09_07_090452_create_account_classes_table.php b/database/migrations/2018_09_07_090452_create_account_classes_table.php
index 383f9f1..5fbae7f 100644
--- a/database/migrations/2018_09_07_090452_create_account_classes_table.php
+++ b/database/migrations/2018_09_07_090452_create_account_classes_table.php
@@ -23,8 +23,8 @@ class CreateAccountClassesTable extends Migration
             $table->smallInteger('number')->unsigned()->unique();
 
             // The type of the account class.
-            $table->integer('io_type')->unsigned();
-            $table->foreign('io_type')->references('id')->on('i_o_types')
+            $table->integer('io_type_id')->unsigned();
+            $table->foreign('io_type_id')->references('id')->on('i_o_types')
                   ->onDelete('no action');
             
             // The scope of the account class.
diff --git a/database/seeds/constants/AccountClassesTableSeeder.php b/database/seeds/constants/AccountClassesTableSeeder.php
index f01604c..bcf7bce 100644
--- a/database/seeds/constants/AccountClassesTableSeeder.php
+++ b/database/seeds/constants/AccountClassesTableSeeder.php
@@ -15,7 +15,7 @@ class AccountClassesTableSeeder extends Seeder
         DB::table('account_classes')->insert([
             [
                 'scope_id' => 1,
-                'io_type' => 1,
+                'io_type_id' => 1,
                 'number' => 1000,
                 'name' => 'EINNAHMEN',
                 'created_at' => Carbon::now()->format('Y-m-d H:i:s'),
@@ -23,7 +23,7 @@ class AccountClassesTableSeeder extends Seeder
             ],
             [
                 'scope_id' => 1,
-                'io_type' => 2,
+                'io_type_id' => 2,
                 'number' => 1500,
                 'name' => 'AUSGABEN',
                 'created_at' => Carbon::now()->format('Y-m-d H:i:s'),
@@ -31,7 +31,7 @@ class AccountClassesTableSeeder extends Seeder
             ],
             [
                 'scope_id' => 2,
-                'io_type' => 1,
+                'io_type_id' => 1,
                 'number' => 2000,
                 'name' => 'EINNAHMEN',
                 'created_at' => Carbon::now()->format('Y-m-d H:i:s'),
@@ -39,7 +39,7 @@ class AccountClassesTableSeeder extends Seeder
             ],
             [
                 'scope_id' => 2,
-                'io_type' => 2,
+                'io_type_id' => 2,
                 'number' => 2500,
                 'name' => 'AUSGABEN',
                 'created_at' => Carbon::now()->format('Y-m-d H:i:s'),
@@ -47,7 +47,7 @@ class AccountClassesTableSeeder extends Seeder
             ],
             [
                 'scope_id' => 3,
-                'io_type' => 1,
+                'io_type_id' => 1,
                 'number' => 3000,
                 'name' => 'EINNAHMEN',
                 'created_at' => Carbon::now()->format('Y-m-d H:i:s'),
@@ -55,7 +55,7 @@ class AccountClassesTableSeeder extends Seeder
             ],
             [
                 'scope_id' => 3,
-                'io_type' => 2,
+                'io_type_id' => 2,
                 'number' => 3500,
                 'name' => 'AUSGABEN',
                 'created_at' => Carbon::now()->format('Y-m-d H:i:s'),
@@ -63,7 +63,7 @@ class AccountClassesTableSeeder extends Seeder
             ],
             [
                 'scope_id' => 4,
-                'io_type' => 1,
+                'io_type_id' => 1,
                 'number' => 4000,
                 'name' => 'EINNAHMEN',
                 'created_at' => Carbon::now()->format('Y-m-d H:i:s'),
@@ -71,7 +71,7 @@ class AccountClassesTableSeeder extends Seeder
             ],
             [
                 'scope_id' => 4,
-                'io_type' => 2,
+                'io_type_id' => 2,
                 'number' => 4500,
                 'name' => 'AUSGABEN',
                 'created_at' => Carbon::now()->format('Y-m-d H:i:s'),
@@ -79,7 +79,7 @@ class AccountClassesTableSeeder extends Seeder
             ],
             [
                 'scope_id' => 5,
-                'io_type' => 1,
+                'io_type_id' => 1,
                 'number' => 5000,
                 'name' => 'EINNAHMEN',
                 'created_at' => Carbon::now()->format('Y-m-d H:i:s'),
@@ -87,7 +87,7 @@ class AccountClassesTableSeeder extends Seeder
             ],
             [
                 'scope_id' => 5,
-                'io_type' => 2,
+                'io_type_id' => 2,
                 'number' => 5500,
                 'name' => 'AUSGABEN',
                 'created_at' => Carbon::now()->format('Y-m-d H:i:s'),