diff --git a/workflow/engine/src/BusinessModel/Department.php b/workflow/engine/src/BusinessModel/Department.php
index c48367f0f..e611aecd1 100644
--- a/workflow/engine/src/BusinessModel/Department.php
+++ b/workflow/engine/src/BusinessModel/Department.php
@@ -151,7 +151,7 @@ class Department
         $dep_uid = Validator::depUid($dep_uid);
         $dep_data = $this->getDepartment($dep_uid);
         if ($dep_data['has_children'] != 0) {
-            throw (new \Exception("Can not delete the department. The department has children"));
+            throw (new \Exception("Can not delete the department, it has a children department."));
         }
         $oDepartment = new \Department();
         $oDepartment->remove($dep_uid);
diff --git a/workflow/engine/src/BusinessModel/Process.php b/workflow/engine/src/BusinessModel/Process.php
index 428762903..fcae7d07a 100644
--- a/workflow/engine/src/BusinessModel/Process.php
+++ b/workflow/engine/src/BusinessModel/Process.php
@@ -238,7 +238,7 @@ class Process
                             switch ($arrayFieldDefinition[$fieldName]["type"]) {
                                 case "array":
                                     if (!is_array($fieldValue)) {
-                                        if (!preg_match("/^\s*array\s*\(.*\)\s*$/", $fieldValue)) {
+                                        if ((!preg_match("/^\s*array\s*\(.*\)\s*$/", $fieldValue)) && $fieldValue != '') {
                                             throw (new \Exception(str_replace(array("{0}"), array($fieldNameAux), "The \"{0}\" attribute is not array")));
                                         }
                                     }
diff --git a/workflow/engine/src/BusinessModel/Validator.php b/workflow/engine/src/BusinessModel/Validator.php
index 0acde6aa5..0e81a0c68 100644
--- a/workflow/engine/src/BusinessModel/Validator.php
+++ b/workflow/engine/src/BusinessModel/Validator.php
@@ -70,7 +70,7 @@ class Validator{
         $oDataset = \DepartmentPeer::doSelectRS( $oCriteria );
         $oDataset->setFetchmode( \ResultSet::FETCHMODE_ASSOC );
         if ($oDataset->next()) {
-            throw (new \Exception("The departament with dep_title: '$dep_title' exist."));
+            throw (new \Exception("The departament with dep_title: '$dep_title' already exists."));
         }
         return $dep_title;
     }
@@ -133,7 +133,7 @@ class Validator{
     static public function isArray($field, $nameField)
     {
         if (!is_array($field)) {
-            throw (new \Exception("The field '$nameField' is not an array."));
+            throw (new \Exception("Invalid value for '$nameField' it must be an array."));
         }
     }
 
@@ -150,7 +150,7 @@ class Validator{
     static public function isBoolean($field, $nameField)
     {
         if (!is_bool($field)) {
-            throw (new \Exception("The field '$nameField' is not a boolean."));
+            throw (new \Exception("Invalid value for '$nameField' it must be a boolean."));
         }
     }
 
diff --git a/workflow/engine/src/Tests/BusinessModel/DepartmentTest.php b/workflow/engine/src/Tests/BusinessModel/DepartmentTest.php
index 588f677de..d926483d2 100644
--- a/workflow/engine/src/Tests/BusinessModel/DepartmentTest.php
+++ b/workflow/engine/src/Tests/BusinessModel/DepartmentTest.php
@@ -37,7 +37,7 @@ class DepartmentTest extends \PHPUnit_Framework_TestCase
      *
      * @covers \BusinessModel\Department::saveDepartment
      * @expectedException        Exception
-     * @expectedExceptionMessage The field '$dep_data' is not an array.
+     * @expectedExceptionMessage Invalid value for '$dep_data' it must be an array.
      *
      * @author Brayan Pereyra (Cochalo) <brayan@colosa.com>
      * @copyright Colosa - Bolivia
@@ -52,7 +52,7 @@ class DepartmentTest extends \PHPUnit_Framework_TestCase
      *
      * @covers \BusinessModel\Department::saveDepartment
      * @expectedException        Exception
-     * @expectedExceptionMessage The field '$create' is not a boolean.
+     * @expectedExceptionMessage Invalid value for '$create' it must be a boolean.
      *
      * @author Brayan Pereyra (Cochalo) <brayan@colosa.com>
      * @copyright Colosa - Bolivia
@@ -171,7 +171,7 @@ class DepartmentTest extends \PHPUnit_Framework_TestCase
      * @param array $dep_data, Data for parent department
      * @covers \BusinessModel\Department::saveDepartment
      * @expectedException        Exception
-     * @expectedExceptionMessage The departament with dep_title: 'Departamento Padre' exist.
+     * @expectedExceptionMessage The departament with dep_title: 'Departamento Padre' already exists.
      *
      * @author Brayan Pereyra (Cochalo) <brayan@colosa.com>
      * @copyright Colosa - Bolivia
@@ -237,7 +237,7 @@ class DepartmentTest extends \PHPUnit_Framework_TestCase
      * @param array $child_data, Data for child department
      * @covers \BusinessModel\Department::saveDepartment
      * @expectedException        Exception
-     * @expectedExceptionMessage The departament with dep_title: 'Departamento Padre' exist.
+     * @expectedExceptionMessage The departament with dep_title: 'Departamento Padre' already exists.
      * @return array
      *
      * @author Brayan Pereyra (Cochalo) <brayan@colosa.com>
@@ -321,7 +321,7 @@ class DepartmentTest extends \PHPUnit_Framework_TestCase
      * @param array $child_data, Data for child department
      * @covers \BusinessModel\Department::deleteDepartment
      * @expectedException        Exception
-     * @expectedExceptionMessage Can not delete the department. The department has children
+     * @expectedExceptionMessage Can not delete the department, it has a children department.
      *
      * @author Brayan Pereyra (Cochalo) <brayan@colosa.com>
      * @copyright Colosa - Bolivia