diff --git a/database/factories/BookingFactory.php b/database/factories/BookingFactory.php
index 683bb47..61983b0 100644
--- a/database/factories/BookingFactory.php
+++ b/database/factories/BookingFactory.php
@@ -1,12 +1,16 @@
 <?php
 
 use Faker\Generator as Faker;
+use Carbon\Carbon;
 
 $factory->define(App\Booking::class, function (Faker $faker) {
     return [
         'date'=> $faker->dateTimeBetween('2014-01-01'),
         'reference' => $faker->text(50),
         'person_or_company' => $faker->name,
-        'note' => $faker->text(10)
+        'note' => $faker->text(10),
+
+        '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/factories/MemberStateFactory.php b/database/factories/MemberStateFactory.php
index a22def4..9369c69 100644
--- a/database/factories/MemberStateFactory.php
+++ b/database/factories/MemberStateFactory.php
@@ -2,11 +2,10 @@
 
 use Faker\Generator as Faker;
 use Carbon\Carbon;
-use Carbon\CarbonPeriod;
 
 $factory->define(App\MemberState::class, function (Faker $faker) {
     return [
             'created_at' => Carbon::now()->format('Y-m-d H:i:s'),
-            'updated_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/factories/SubBookingFactory.php b/database/factories/SubBookingFactory.php
index c6385c1..8d78288 100644
--- a/database/factories/SubBookingFactory.php
+++ b/database/factories/SubBookingFactory.php
@@ -1,9 +1,58 @@
 <?php
 
 use Faker\Generator as Faker;
+use Carbon\Carbon;
+
+use App\Project;
+use App\AccountType;
+use App\PersonTarget;
+use App\Booking;
 
 $factory->define(App\SubBooking::class, function (Faker $faker) {
+
+    // Select randomly an existing target from the database
+    $randomPersonTarget = PersonTarget::all()->random();
+    $randomAccountType = null;
+
+    // Randomly decide, if the target is paid, underpaid or overpaid 
+    if (rand_bool(20)) {
+       // Overpaid
+       if ($randomPersonTarget->ioType->name === 'Einnahme') {
+           $randomAccountType = AccountType::incomes()->random();
+           $amount = $randomPersonTarget->difference() + rand(1, 100);
+       } else {
+           $randomAccountType = AccountType::expeditures()->random();
+           $amount = $randomPersonTarget->difference() + rand(1, 100);
+       }
+    } else if (rand_bool(20)) {
+       // Underpaid
+       if ($randomPersonTarget->ioType->name === 'Einnahme') {
+           $randomAccountType = AccountType::incomes()->random();
+           $amount = $randomPersonTarget->difference() - rand(1, $randomPersonTarget->difference());
+       } else {
+           $randomAccountType = AccountType::expeditures()->random();
+           $amount = $randomPersonTarget->difference() - rand(1, $randomPersonTarget->difference());
+       }
+    } else {
+       if ($randomPersonTarget->ioType->name === 'Einnahme') {
+           $randomAccountType = AccountType::incomes()->random();
+           $amount = $randomPersonTarget->difference();
+       } else {
+           $randomAccountType = AccountType::expeditures()->random();
+           $amount = $randomPersonTarget->difference();
+       }
+    }
+    
     return [
-        ''
+        'booking_id' => Booking::all('id')->random()->id,
+        'project_id' => Project::all('id')->random()->id,
+        'account_type_id' => $randomAccountType->id,
+        'person_target_id' => $randomPersonTarget->id,
+
+        'reference' => $faker->text(50),
+        'amount' => $amount,
+
+        '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/seeds/data/test/TestSubBookingsTableSeeder.php b/database/seeds/data/test/TestSubBookingsTableSeeder.php
index 4a156f8..892cac6 100644
--- a/database/seeds/data/test/TestSubBookingsTableSeeder.php
+++ b/database/seeds/data/test/TestSubBookingsTableSeeder.php
@@ -11,6 +11,6 @@ class TestSubBookingsTableSeeder extends Seeder
      */
     public function run()
     {
-        //
+        factory(App\SubBooking::class, 800)->create();
     }
 }