diff --git a/database/factories/SubProcessFactory.php b/database/factories/SubProcessFactory.php
new file mode 100644
index 000000000..b98d4ee9b
--- /dev/null
+++ b/database/factories/SubProcessFactory.php
@@ -0,0 +1,18 @@
+<?php
+
+$factory->define(\ProcessMaker\Model\SubProcess::class, function () {
+    return [
+        'SP_UID' => G::generateUniqueID(),
+        'PRO_UID' => G::generateUniqueID(),
+        'TAS_UID' => G::generateUniqueID(),
+        'PRO_PARENT' => G::generateUniqueID(),
+        'TAS_PARENT' => G::generateUniqueID(),
+        'SP_TYPE' => '',
+        'SP_SYNCHRONOUS' => 0,
+        'SP_SYNCHRONOUS_TYPE' => '',
+        'SP_SYNCHRONOUS_WAIT' => 0,
+        'SP_VARIABLES_OUT' => '',
+        'SP_VARIABLES_IN' => '',
+        'SP_GRID_IN' => ''
+    ];
+});
diff --git a/tests/unit/workflow/engine/src/ProcessMaker/Model/DelegationTest.php b/tests/unit/workflow/engine/src/ProcessMaker/Model/DelegationTest.php
index d7dc062ed..f26de1584 100644
--- a/tests/unit/workflow/engine/src/ProcessMaker/Model/DelegationTest.php
+++ b/tests/unit/workflow/engine/src/ProcessMaker/Model/DelegationTest.php
@@ -13,6 +13,7 @@ use ProcessMaker\Model\GroupUser;
 use ProcessMaker\Model\Groupwf;
 use ProcessMaker\Model\Process;
 use ProcessMaker\Model\ProcessCategory;
+use ProcessMaker\Model\SubProcess;
 use ProcessMaker\Model\Task;
 use ProcessMaker\Model\TaskUser;
 use ProcessMaker\Model\User;
@@ -2538,4 +2539,41 @@ class DelegationTest extends TestCase
         $this->assertNotEmpty($result);
         $this->assertEquals($result, $delegation->DEL_TITLE);
     }
+
+    /**
+     * It should test the hasActiveParentsCases() method
+     * 
+     * @covers \ProcessMaker\Model\Delegation::hasActiveParentsCases()
+     * @test
+     */
+    public function it_should_test_the_has_active_parents_cases_method()
+    {
+        $process = factory(Process::class)->create();
+        $processParent = factory(Process::class, 3)->create();
+        factory(SubProcess::class)->create([
+            'PRO_UID' => $process['PRO_UID'],
+            'PRO_PARENT' => $processParent[0]['PRO_UID']
+        ]);
+        factory(SubProcess::class)->create([
+            'PRO_UID' => $process['PRO_UID'],
+            'PRO_PARENT' => $processParent[1]['PRO_UID']
+        ]);
+        factory(SubProcess::class)->create([
+            'PRO_UID' => $process['PRO_UID'],
+            'PRO_PARENT' => $processParent[2]['PRO_UID']
+        ]);
+
+        $parents = SubProcess::getProParents($process['PRO_UID']);
+
+        factory(Delegation::class)->create([
+            'PRO_UID' => $parents[0]['PRO_PARENT'],
+            'TAS_UID' => $parents[0]['TAS_PARENT'],
+            'DEL_THREAD_STATUS' => 'OPEN'
+        ]);
+
+        $res = Delegation::hasActiveParentsCases($parents);
+
+        // Assert the result is true
+        $this->assertTrue($res);
+    }
 }
\ No newline at end of file
diff --git a/tests/unit/workflow/engine/src/ProcessMaker/Model/SubProcessTest.php b/tests/unit/workflow/engine/src/ProcessMaker/Model/SubProcessTest.php
new file mode 100644
index 000000000..61edcbb5f
--- /dev/null
+++ b/tests/unit/workflow/engine/src/ProcessMaker/Model/SubProcessTest.php
@@ -0,0 +1,64 @@
+<?php
+
+namespace Tests\unit\workflow\engine\src\ProcessMaker\Model;
+
+use Illuminate\Foundation\Testing\DatabaseTransactions;
+use ProcessMaker\Model\Process;
+use ProcessMaker\Model\SubProcess;
+use Tests\TestCase;
+
+/**
+ * Class ProcessTest
+ *
+ * @coversDefaultClass \ProcessMaker\Model\SubProcess
+ */
+class SubProcessTest extends TestCase
+{
+    use DatabaseTransactions;
+
+    /**
+     * Call the setUp parent method
+     */
+    public function setUp()
+    {
+        parent::setUp();
+    }
+
+    /**
+     * It should test the getProParents() method
+     * 
+     * @covers \ProcessMaker\Model\SubProcess::getProParents()
+     * @test
+     */
+    public function it_should_test_the_get_pro_parents_method()
+    {
+        $process = factory(Process::class)->create();
+        $processParent = factory(Process::class, 3)->create();
+        factory(SubProcess::class)->create([
+            'PRO_UID' => $process['PRO_UID'],
+            'PRO_PARENT' => $processParent[0]['PRO_UID']
+        ]);
+        factory(SubProcess::class)->create([
+            'PRO_UID' => $process['PRO_UID'],
+            'PRO_PARENT' => $processParent[1]['PRO_UID']
+        ]);
+        factory(SubProcess::class)->create([
+            'PRO_UID' => $process['PRO_UID'],
+            'PRO_PARENT' => $processParent[2]['PRO_UID']
+        ]);
+
+        $res = SubProcess::getProParents($process['PRO_UID']);
+
+        $res = array_map(function ($x) {
+            return $x['PRO_PARENT'];
+        }, $res);
+
+        // Assert the subprocess has three parents
+        $this->assertCount(3, $res);
+
+        // Assert that the parents are the processes created
+        $this->assertContains($processParent[0]['PRO_UID'], $res);
+        $this->assertContains($processParent[1]['PRO_UID'], $res);
+        $this->assertContains($processParent[2]['PRO_UID'], $res);
+    }
+}
diff --git a/workflow/engine/content/translations/english/processmaker.en.po b/workflow/engine/content/translations/english/processmaker.en.po
index 23221227e..5ffcd9d01 100755
--- a/workflow/engine/content/translations/english/processmaker.en.po
+++ b/workflow/engine/content/translations/english/processmaker.en.po
@@ -3383,6 +3383,12 @@ msgstr "You can not delete the template {0} because it has a relationship with E
 msgid "It is not possible to delete the department because it has subdepartments."
 msgstr "It is not possible to delete the department because it has subdepartments."
 
+# TRANSLATION
+# LABEL/ID_CANT_DELETE_SUB_PROCESS_PARENT_HAS_ACTIVE_CASES
+#: LABEL/ID_CANT_DELETE_SUB_PROCESS_PARENT_HAS_ACTIVE_CASES
+msgid "Is not possible to delete sub-process cases, while the master process has active cases."
+msgstr "Is not possible to delete sub-process cases, while the master process has active cases."
+
 # TRANSLATION
 # LABEL/ID_CANT_DELETE_DEPARTMENT_HAS_USERS
 #: LABEL/ID_CANT_DELETE_DEPARTMENT_HAS_USERS
diff --git a/workflow/engine/data/mysql/insert.sql b/workflow/engine/data/mysql/insert.sql
index 9f3b08360..6ef6d89ce 100755
--- a/workflow/engine/data/mysql/insert.sql
+++ b/workflow/engine/data/mysql/insert.sql
@@ -57371,6 +57371,7 @@ INSERT INTO TRANSLATION (TRN_CATEGORY,TRN_ID,TRN_LANG,TRN_VALUE,TRN_UPDATE_DATE
 ( 'LABEL','ID_CANNOT_IMPORT','en','CANNOT IMPORT','2017-10-03') ,
 ( 'LABEL','ID_CANNOT_REMOVE_TEMPLATE_EMAIL_EVENT','en','You can not delete the template {0} because it has a relationship with Email Event','2016-07-05') ,
 ( 'LABEL','ID_CANT_DELETE_DEPARTMENT_HAS_CHILDREN','en','It is not possible to delete the department because it has subdepartments.','2014-10-21') ,
+( 'LABEL','ID_CANT_DELETE_SUB_PROCESS_PARENT_HAS_ACTIVE_CASES','en','Is not possible to delete sub-process cases, while the master process has active cases.','2021-03-23') ,
 ( 'LABEL','ID_CANT_DELETE_DEPARTMENT_HAS_USERS','en','Department cannot be deleted while it has assigned users.','2015-03-23') ,
 ( 'LABEL','ID_CANT_RESOLVE_APPLICATION','en','Can''t resolve the Aplication ID for this request.','2014-01-15') ,
 ( 'LABEL','ID_CANT_SAVE_TRIGGER','en','A trigger with the same name already exists in this process.','2014-05-29') ,
diff --git a/workflow/engine/methods/processes/processes_DeleteCases.php b/workflow/engine/methods/processes/processes_DeleteCases.php
index 7fdaee1bb..f2f156133 100644
--- a/workflow/engine/methods/processes/processes_DeleteCases.php
+++ b/workflow/engine/methods/processes/processes_DeleteCases.php
@@ -1,4 +1,8 @@
 <?php
+
+use ProcessMaker\Model\Delegation;
+use ProcessMaker\Model\SubProcess;
+
 /**
  * processes_DeleteCases.php
  *
@@ -14,6 +18,15 @@ try {
     $uids = explode(',', $_POST['PRO_UIDS']);
     $process = new Process();
     foreach ($uids as $uid) {
+        $parents = SubProcess::getProParents($uid);
+        if (!empty($parents)) {
+            if (Delegation::hasActiveParentsCases($parents)) {
+                $resp->status = false;
+                $resp->msg = G::LoadTranslation('ID_CANT_DELETE_SUB_PROCESS_PARENT_HAS_ACTIVE_CASES');
+                echo G::json_encode($resp);
+                die();
+            }
+        }
         $process->deleteProcessCases($uid);
     }
 
@@ -21,11 +34,9 @@ try {
     $resp->msg = G::LoadTranslation('ID_ALL_RECORDS_DELETED_SUCESSFULLY');
 
     echo G::json_encode($resp);
-
 } catch (Exception $e) {
     $resp->status = false;
     $resp->msg = $e->getMessage();
     $resp->trace = $e->getTraceAsString();
     echo G::json_encode($resp);
 }
-
diff --git a/workflow/engine/src/ProcessMaker/Model/Delegation.php b/workflow/engine/src/ProcessMaker/Model/Delegation.php
index 241ca7e93..2d889e07a 100644
--- a/workflow/engine/src/ProcessMaker/Model/Delegation.php
+++ b/workflow/engine/src/ProcessMaker/Model/Delegation.php
@@ -834,9 +834,9 @@ class Delegation extends Model
      */
     public function scopeJoinPreviousIndex($query)
     {
-        $query->leftJoin('APP_DELEGATION AS AD', function( $leftJoin) {
+        $query->leftJoin('APP_DELEGATION AS AD', function ($leftJoin) {
             $leftJoin->on('APP_DELEGATION.APP_NUMBER', '=', 'AD.APP_NUMBER')
-            ->on('APP_DELEGATION.DEL_PREVIOUS', '=', 'AD.DEL_INDEX');
+                ->on('APP_DELEGATION.DEL_PREVIOUS', '=', 'AD.DEL_INDEX');
         });
 
         return $query;
@@ -1863,7 +1863,7 @@ class Delegation extends Model
         $cases = new Cases;
         if (!is_array($caseData)) {
             $r = $cases->unserializeData($caseData);
-            if($r !== false) {
+            if ($r !== false) {
                 $caseData = $r;
             }
         }
@@ -1877,13 +1877,13 @@ class Delegation extends Model
             // If is empty get the previous title
             if ($delIndexPrevious > 0) {
                 $thread = self::getThreadInfo($appNumber, $delIndexPrevious);
-                if(empty($thread['DEL_TITLE'])) {
-                    $threadTitle = '# '. $appNumber;
+                if (empty($thread['DEL_TITLE'])) {
+                    $threadTitle = '# ' . $appNumber;
                 } else {
                     $threadTitle = $thread['DEL_TITLE'];
                 }
             } else {
-                $threadTitle = '# '. $appNumber;
+                $threadTitle = '# ' . $appNumber;
             }
         }
 
@@ -1949,4 +1949,24 @@ class Delegation extends Model
 
         return $results;
     }
+
+    /**
+     * Check if a subprocess has active parent cases
+     * 
+     * @param array $parents
+     * @return bool
+     */
+    public static function hasActiveParentsCases($parents)
+    {
+        foreach ($parents as $parent) {
+            $query = Delegation::select()->where('PRO_UID', $parent['PRO_PARENT'])
+                ->where('TAS_UID', $parent['TAS_PARENT'])->where('DEL_THREAD_STATUS', 'OPEN')
+                ->limit(1);
+            $res = $query->get()->values()->toArray();
+            if (!empty($res)) {
+                return true;
+            }
+        }
+        return false;
+    }
 }
diff --git a/workflow/engine/src/ProcessMaker/Model/SubProcess.php b/workflow/engine/src/ProcessMaker/Model/SubProcess.php
new file mode 100644
index 000000000..e7ec2421e
--- /dev/null
+++ b/workflow/engine/src/ProcessMaker/Model/SubProcess.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace ProcessMaker\Model;
+
+use Illuminate\Database\Eloquent\Model;
+use ProcessMaker\Model\Application;
+
+class SubProcess extends Model
+{
+    protected $table = 'SUB_PROCESS';
+    protected $primaryKey = 'SP_UID';
+    // We do not have create/update timestamps for this table
+    public $timestamps = false;
+
+    /**
+     * Get he Process parents of a subprocess
+     * 
+     * @param string $proUid
+     * @return array
+     */
+    public static function getProParents($proUid)
+    {
+        $query = SubProcess::select('PRO_PARENT', 'TAS_PARENT')->where('PRO_UID', $proUid);
+        return $query->get()->values()->toArray();
+    }
+}