diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index e9b4371..4bbb819 100755
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -16,7 +16,7 @@ Generally, the development philosophy is result orientated. This means that anyo
 
 Developers  are encouraged to pick open tasks with high priorities according to their own skill level. Senior developers may  directly assign tasks to developers based on their importance. New  developers may find it easier to start with a task that has a low  priority as they often also have a lower difficulty.
 
-Open tasks can be found in the project overview: [PROJECT.md](../Project/PROJECT.md)
+Open tasks can be found in the project overview: [PROJECT.md](https://github.com/Karaka-Management/Organization-Guide/blob/master/Project/PROJECT.md)
 
 Tasks  currently in development are prefixed in the priority column with an  asterisk `*` and a name tag in the task description of the developer who is working on the task.
 
diff --git a/Controller/ApiController.php b/Controller/ApiController.php
index 3e2996e..5354a46 100755
--- a/Controller/ApiController.php
+++ b/Controller/ApiController.php
@@ -58,7 +58,7 @@ final class ApiController extends Controller
      *
      * @since 1.0.0
      */
-    public function apiEmployeeCreate(RequestAbstract $request, ResponseAbstract $response, $data = null) : void
+    public function apiEmployeeCreate(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : void
     {
         if ($request->getData('profiles') !== null) {
             $this->apiEmployeeFromAccountCreate($request, $response, $data);
@@ -82,7 +82,7 @@ final class ApiController extends Controller
      *
      * @since 1.0.0
      */
-    public function apiEmployeeFromAccountCreate(RequestAbstract $request, ResponseAbstract $response, $data = null) : void
+    public function apiEmployeeFromAccountCreate(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : void
     {
         if (!empty($val = $this->validateEmployeeFromAccountCreate($request))) {
             $response->set('employee_create', new FormValidation($val));
@@ -151,7 +151,7 @@ final class ApiController extends Controller
      *
      * @since 1.0.0
      */
-    public function apiEmployeeNewCreate(RequestAbstract $request, ResponseAbstract $response, $data = null) : void
+    public function apiEmployeeNewCreate(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : void
     {
         if (!empty($val = $this->validateEmployeeNewCreate($request))) {
             $response->set('employee_create', new FormValidation($val));
@@ -222,7 +222,7 @@ final class ApiController extends Controller
      *
      * @since 1.0.0
      */
-    public function apiEmployeeHistoryCreate(RequestAbstract $request, ResponseAbstract $response, $data = null) : void
+    public function apiEmployeeHistoryCreate(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : void
     {
         if (!empty($val = $this->validateEmployeeHistoryCreate($request))) {
             $response->set('history_create', new FormValidation($val));
@@ -297,7 +297,7 @@ final class ApiController extends Controller
      *
      * @since 1.0.0
      */
-    public function apiEmployeeWorkHistoryCreate(RequestAbstract $request, ResponseAbstract $response, $data = null) : void
+    public function apiEmployeeWorkHistoryCreate(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : void
     {
         if (!empty($val = $this->validateEmployeeWorkHistoryCreate($request))) {
             $response->set('history_work_create', new FormValidation($val));
@@ -376,7 +376,7 @@ final class ApiController extends Controller
      *
      * @since 1.0.0
      */
-    public function apiEmployeeEducationHistoryCreate(RequestAbstract $request, ResponseAbstract $response, $data = null) : void
+    public function apiEmployeeEducationHistoryCreate(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : void
     {
         if (!empty($val = $this->validateEmployeeEducationHistoryCreate($request))) {
             $response->set('history_education_create', new FormValidation($val));
diff --git a/Controller/BackendController.php b/Controller/BackendController.php
index 2b6cbf4..564c355 100755
--- a/Controller/BackendController.php
+++ b/Controller/BackendController.php
@@ -45,7 +45,7 @@ final class BackendController extends Controller
      * @since 1.0.0
      * @codeCoverageIgnore
      */
-    public function viewHrStaffList(RequestAbstract $request, ResponseAbstract $response, $data = null) : RenderableInterface
+    public function viewHrStaffList(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : RenderableInterface
     {
         $view = new View($this->app->l11nManager, $request, $response);
         $view->setTemplate('/Modules/HumanResourceManagement/Theme/Backend/staff-list');
@@ -74,7 +74,7 @@ final class BackendController extends Controller
      * @since 1.0.0
      * @codeCoverageIgnore
      */
-    public function viewHrStaffCreate(RequestAbstract $request, ResponseAbstract $response, $data = null) : RenderableInterface
+    public function viewHrStaffCreate(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : RenderableInterface
     {
         $view = new View($this->app->l11nManager, $request, $response);
         $view->setTemplate('/Modules/HumanResourceManagement/Theme/Backend/staff-create');
@@ -98,7 +98,7 @@ final class BackendController extends Controller
      * @since 1.0.0
      * @codeCoverageIgnore
      */
-    public function viewHrStaffProfile(RequestAbstract $request, ResponseAbstract $response, $data = null) : RenderableInterface
+    public function viewHrStaffProfile(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : RenderableInterface
     {
         $view = new View($this->app->l11nManager, $request, $response);
         $view->setTemplate('/Modules/HumanResourceManagement/Theme/Backend/staff-profile');
@@ -142,7 +142,7 @@ final class BackendController extends Controller
      * @since 1.0.0
      * @codeCoverageIgnore
      */
-    public function viewHrDepartmentList(RequestAbstract $request, ResponseAbstract $response, $data = null) : RenderableInterface
+    public function viewHrDepartmentList(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : RenderableInterface
     {
         $view = new View($this->app->l11nManager, $request, $response);
         $view->setTemplate('/Modules/HumanResourceManagement/Theme/Backend/department-list');
@@ -165,7 +165,7 @@ final class BackendController extends Controller
      * @since 1.0.0
      * @codeCoverageIgnore
      */
-    public function viewHrPositionList(RequestAbstract $request, ResponseAbstract $response, $data = null) : RenderableInterface
+    public function viewHrPositionList(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : RenderableInterface
     {
         $view = new View($this->app->l11nManager, $request, $response);
         $view->setTemplate('/Modules/HumanResourceManagement/Theme/Backend/position-list');
@@ -188,7 +188,7 @@ final class BackendController extends Controller
      * @since 1.0.0
      * @codeCoverageIgnore
      */
-    public function viewHrPositionCreate(RequestAbstract $request, ResponseAbstract $response, $data = null) : RenderableInterface
+    public function viewHrPositionCreate(RequestAbstract $request, ResponseAbstract $response, mixed $data = null) : RenderableInterface
     {
         $view = new View($this->app->l11nManager, $request, $response);
         $view->setTemplate('/Modules/HumanResourceManagement/Theme/Backend/position-create');
diff --git a/Models/EmployeeEducationHistoryMapper.php b/Models/EmployeeEducationHistoryMapper.php
index a1b9b1e..266c0b7 100755
--- a/Models/EmployeeEducationHistoryMapper.php
+++ b/Models/EmployeeEducationHistoryMapper.php
@@ -47,7 +47,7 @@ final class EmployeeEducationHistoryMapper extends DataMapperFactory
     /**
      * Belongs to.
      *
-     * @var array<string, array{mapper:string, external:string}>
+     * @var array<string, array{mapper:string, external:string, column?:string, by?:string}>
      * @since 1.0.0
      */
     public const BELONGS_TO = [
diff --git a/Models/EmployeeHistoryMapper.php b/Models/EmployeeHistoryMapper.php
index 96a8d2a..0e91c0a 100755
--- a/Models/EmployeeHistoryMapper.php
+++ b/Models/EmployeeHistoryMapper.php
@@ -49,7 +49,7 @@ final class EmployeeHistoryMapper extends DataMapperFactory
     /**
      * Belongs to.
      *
-     * @var array<string, array{mapper:string, external:string}>
+     * @var array<string, array{mapper:string, external:string, column?:string, by?:string}>
      * @since 1.0.0
      */
     public const BELONGS_TO = [
diff --git a/Models/EmployeeMapper.php b/Models/EmployeeMapper.php
index f000665..3c9c3c4 100755
--- a/Models/EmployeeMapper.php
+++ b/Models/EmployeeMapper.php
@@ -44,7 +44,7 @@ final class EmployeeMapper extends DataMapperFactory
     /**
      * Belongs to.
      *
-     * @var array<string, array{mapper:string, external:string}>
+     * @var array<string, array{mapper:string, external:string, column?:string, by?:string}>
      * @since 1.0.0
      */
     public const BELONGS_TO = [
diff --git a/Models/EmployeeWorkHistoryMapper.php b/Models/EmployeeWorkHistoryMapper.php
index ed7e401..c64f3fc 100755
--- a/Models/EmployeeWorkHistoryMapper.php
+++ b/Models/EmployeeWorkHistoryMapper.php
@@ -45,7 +45,7 @@ final class EmployeeWorkHistoryMapper extends DataMapperFactory
     /**
      * Belongs to.
      *
-     * @var array<string, array{mapper:string, external:string}>
+     * @var array<string, array{mapper:string, external:string, column?:string, by?:string}>
      * @since 1.0.0
      */
     public const BELONGS_TO = [