diff --git a/SeedDMS_Core/Core/inc.ClassObject.php b/SeedDMS_Core/Core/inc.ClassObject.php
index 0f7b90eb8..a2f0b1ae4 100644
--- a/SeedDMS_Core/Core/inc.ClassObject.php
+++ b/SeedDMS_Core/Core/inc.ClassObject.php
@@ -298,6 +298,7 @@ class SeedDMS_Core_Object { /* {{{ */
 			$this->getAttributes();
 		}
 		if(isset($this->_attributes[$attrdef->getId()])) {
+			$oldvalue = $this->_attributes[$attrdef->getId()]->getValue();
 			switch(get_class($this)) {
 				case $this->_dms->getClassname('document'):
 					$queryStr = "DELETE FROM `tblDocumentAttributes` WHERE `document`=".$this->_id." AND `attrdef`=".$attrdef->getId();
@@ -315,6 +316,14 @@ class SeedDMS_Core_Object { /* {{{ */
 			if (!$res)
 				return false;
 
+			/* Check if 'onPostRemoveAttribute' callback is set */
+			if(isset($this->_dms->callbacks['onPostRemoveAttribute'])) {
+				foreach($this->_dms->callbacks['onPostRemoveAttribute'] as $callback) {
+					if(!call_user_func($callback[0], $callback[1], $this, $attrdef, $oldvalue)) {
+					}
+				}
+			}
+
 			unset($this->_attributes[$attrdef->getId()]);
 		}
 		return true;
diff --git a/SeedDMS_Core/package.xml b/SeedDMS_Core/package.xml
index c6a2273ee..b06963a7f 100644
--- a/SeedDMS_Core/package.xml
+++ b/SeedDMS_Core/package.xml
@@ -28,7 +28,7 @@
 - getLastWorkflowLog() returns a workflow entry even if the workflow has ended
 - backport setFileType() from 6.0.x
 - add SeedDMS_Core_File::fileExtension()
-- add callbacks on onPostUpdateAttribute and onPostAddAttribute
+- add callbacks on onPostUpdateAttribute, onPostRemoveAttribute, onPostAddAttribute
  </notes>
  <contents>
   <dir baseinstalldir="SeedDMS" name="/">