diff --git a/application/Espo/Core/Acl.php b/application/Espo/Core/Acl.php
index 36352cb75b..e70f275721 100644
--- a/application/Espo/Core/Acl.php
+++ b/application/Espo/Core/Acl.php
@@ -118,5 +118,15 @@ class Acl
     {
         return $this->getAclManager()->getScopeForbiddenFieldList($this->getUser(), $scope, $action, $thresholdLevel);
     }
+
+    public function checkUserPermission($target, $permissionType = 'userPermission')
+    {
+        return $this->getAclManager()->checkUserPermission($this->getUser(), $target, $permissionType);
+    }
+
+    public function checkAssignmentPermission($target)
+    {
+        return $this->getAclManager()->checkAssignmentPermission($this->getUser(), $target);
+    }
 }
 
diff --git a/application/Espo/Core/AclManager.php b/application/Espo/Core/AclManager.php
index 51aeb0e051..08b0d60a31 100644
--- a/application/Espo/Core/AclManager.php
+++ b/application/Espo/Core/AclManager.php
@@ -235,5 +235,40 @@ class AclManager
         if ($user->isAdmin()) return [];
         return $this->getTable($user)->getScopeForbiddenFieldList($scope, $action, $thresholdLevel);
     }
+
+    public function checkUserPermission(User $user, $target, $permissionType = 'userPermission')
+    {
+        $permission = $this->get($user, $permissionType);
+
+        if (is_object($target)) {
+            $userId = $target->id;
+        } else {
+            $userId = $target;
+        }
+
+        if ($user->id === $userId) return true;
+
+        if ($permission === 'no') {
+            return false;
+        }
+
+        if ($permission === 'yes') {
+            return true;
+        }
+
+        if ($permission === 'team') {
+            $teamIdList = $user->getLinkMultipleIdList('teams');
+            if (!$this->getContainer()->get('entityManager')->getRepository('User')->checkBelongsToAnyOfTeams($userId, $teamIdList)) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    public function checkAssignmentPermission(User $user, $target)
+    {
+        return $this->checkUserPermission($user, $target, 'assignmentPermission');
+    }
 }
 
diff --git a/application/Espo/Modules/Crm/Repositories/Meeting.php b/application/Espo/Modules/Crm/Repositories/Meeting.php
index 387e6eb0ab..a3cb95ab4f 100644
--- a/application/Espo/Modules/Crm/Repositories/Meeting.php
+++ b/application/Espo/Modules/Crm/Repositories/Meeting.php
@@ -61,19 +61,23 @@ class Meeting extends \Espo\Core\ORM\Repositories\RDB
         }
 
         $assignedUserId = $entity->get('assignedUserId');
-        if ($assignedUserId && $entity->has('usersIds')) {
-            $usersIds = $entity->get('usersIds');
-            if (!is_array($usersIds)) {
-                $usersIds = array();
-            }
-            if (!in_array($assignedUserId, $usersIds)) {
-                $usersIds[] = $assignedUserId;
-                $entity->set('usersIds', $usersIds);
-                $hash = $entity->get('usersNames');
-                if ($hash instanceof \StdClass) {
-                    $hash->$assignedUserId = $entity->get('assignedUserName');
-                    $entity->set('usersNames', $hash);
+        if ($assignedUserId) {
+            if ($entity->has('usersIds')) {
+                $usersIds = $entity->get('usersIds');
+                if (!is_array($usersIds)) {
+                    $usersIds = [];
                 }
+                if (!in_array($assignedUserId, $usersIds)) {
+                    $usersIds[] = $assignedUserId;
+                    $entity->set('usersIds', $usersIds);
+                    $hash = $entity->get('usersNames');
+                    if ($hash instanceof \StdClass) {
+                        $hash->$assignedUserId = $entity->get('assignedUserName');
+                        $entity->set('usersNames', $hash);
+                    }
+                }
+            } else {
+                $entity->addLinkMultipleId('users', $assignedUserId);
             }
             if ($entity->isNew()) {
                 $currentUserId = $this->getEntityManager()->getUser()->id;
diff --git a/application/Espo/Modules/Crm/Services/Meeting.php b/application/Espo/Modules/Crm/Services/Meeting.php
index c0b5619233..9cd23d3589 100644
--- a/application/Espo/Modules/Crm/Services/Meeting.php
+++ b/application/Espo/Modules/Crm/Services/Meeting.php
@@ -76,6 +76,39 @@ class Meeting extends \Espo\Services\Record
         return $this->getInjection('dateTime');
     }
 
+    public function checkAssignment(Entity $entity)
+    {
+        $result = parent::checkAssignment($entity);
+        if (!$result) return false;
+
+        $userIdList = $entity->get('usersIds');
+        if (!is_array($userIdList)) {
+            $userIdList = [];
+        }
+
+        $newIdList = [];
+        if (!$entity->isNew()) {
+            $existingIdList = [];
+            foreach ($entity->get('users') as $user) {
+                $existingIdList[] = $user->id;
+            }
+            foreach ($userIdList as $id) {
+                if (!in_array($id, $existingIdList)) {
+                    $newIdList[] = $id;
+                }
+            }
+        } else {
+            $newIdList = $userIdList;
+        }
+
+        foreach ($newIdList as $userId) {
+            if (!$this->getAcl()->checkAssignmentPermission($userId)) {
+                return false;
+            }
+        }
+
+        return true;
+    }
 
     protected function getInvitationManager()
     {
diff --git a/application/Espo/Services/Record.php b/application/Espo/Services/Record.php
index 3b0738859e..cf34382049 100644
--- a/application/Espo/Services/Record.php
+++ b/application/Espo/Services/Record.php
@@ -391,8 +391,8 @@ class Record extends \Espo\Core\Services\Base
                     return false;
                 }
             } else if ($assignmentPermission == 'team') {
-                $teamIds = $this->getUser()->get('teamsIds');
-                if (!$this->getEntityManager()->getRepository('User')->checkBelongsToAnyOfTeams($assignedUserId, $teamIds)) {
+                $teamIdList = $this->getUser()->get('teamsIds');
+                if (!$this->getEntityManager()->getRepository('User')->checkBelongsToAnyOfTeams($assignedUserId, $teamIdList)) {
                     return false;
                 }
             }
diff --git a/client/modules/crm/src/views/meeting/fields/users.js b/client/modules/crm/src/views/meeting/fields/users.js
index 04c7791c6c..aedaa437d7 100644
--- a/client/modules/crm/src/views/meeting/fields/users.js
+++ b/client/modules/crm/src/views/meeting/fields/users.js
@@ -30,7 +30,21 @@ Espo.define('crm:views/meeting/fields/users', 'crm:views/meeting/fields/attendee
 
     return Dep.extend({
 
-        selectPrimaryFilterName: 'active'
+        selectPrimaryFilterName: 'active',
+
+        init: function () {
+            this.assignmentPermission = this.getAcl().get('assignmentPermission');
+            if (this.assignmentPermission == 'no') {
+                this.readOnly = true;
+            }
+            Dep.prototype.init.call(this);
+        },
+
+        getSelectBoolFilterList: function () {
+            if (this.assignmentPermission == 'team') {
+                return ['onlyMyTeam'];
+            }
+        }
 
     });