diff --git a/plm_box/models/ir_attachment.py b/plm_box/models/ir_attachment.py
index db6f5dba..536ca1f1 100755
--- a/plm_box/models/ir_attachment.py
+++ b/plm_box/models/ir_attachment.py
@@ -192,4 +192,38 @@ def getDocumentState(self, vals):
                 return "check-in"
         return "check-out-by-me"
 
+    @api.model
+    def checkDocumentPresent(self, doc_dict={}):
+        for str_box_id, vals in doc_dict.items():
+            box_id = int(str_box_id)
+            box_brws = self.env['plm.box'].browse(box_id)
+            for str_doc_id, doc_vals in vals.items():
+                doc_id = int(str_doc_id)
+                for doc_brws in self.search([('id', '=', doc_id)]):
+                    checksum = doc_vals.get('checksum', '')
+                    doc_dict[str_box_id][str_doc_id]['check_mode'] = doc_brws.getDocumentState()
+                    if doc_id in box_brws.document_rel.ids:
+                        if not checksum:
+                            doc_dict[str_box_id][str_doc_id]['update'] = 'download'
+                        elif doc_brws.checksum != checksum:
+                            doc_condition = doc_brws.getDocumentState()
+                            if doc_condition == 'check-out-by-me':
+                                doc_dict[str_box_id][str_doc_id]['update'] = 'upload'
+                            else:
+                                doc_dict[str_box_id][str_doc_id]['update'] = 'download'
+                        else:
+                            doc_dict[str_box_id][str_doc_id]['update'] = 'none'
+                    else:
+                        cad_opens = self.env['plm.cad.open'].search([
+                            ('document_id', '=', doc_id)
+                        ])
+                        if len(cad_opens.ids) > 1:
+                            doc_dict[str_box_id][str_doc_id]['update'] = 'delete'
+                        elif doc_brws:
+                            doc_dict[str_box_id][str_doc_id]['update'] = 'delete'
+                        else:
+                            doc_dict[str_box_id][str_doc_id]['update'] = 'upload'
+        logging.info('Box sincronize res %r' % (doc_dict))
+        return doc_dict
+
 # vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4:
diff --git a/plm_box/models/plm_box.py b/plm_box/models/plm_box.py
index ef8f03d1..475f27b0 100755
--- a/plm_box/models/plm_box.py
+++ b/plm_box/models/plm_box.py
@@ -215,6 +215,21 @@ def setRelatedDocs(self, parentBrws):
     @api.model
     def getRelatedEntities(self, parentBrws):
         objRelList = []
+        document_data = dict()
+        for doc in parentBrws.document_rel:
+
+            document_data[str(doc.id)]={
+                "name": doc.engineering_code or '',
+                "description": doc.description or '',
+                "state": doc.engineering_state or '',
+                "readonly": self.docReadonlyCompute(doc.id),
+                "write_date": doc.write_date or '',
+                "revisionid": doc.engineering_revision or '',
+                "fileName": doc.name or '',
+                "checkoutUser": doc.checkout_user or False,
+            }
+        objRelList.append({'document_rel': document_data})
+
         for product_product_id in parentBrws.product_id:
             objRelList.append(
                 {
@@ -662,8 +677,7 @@ def getBoxesStructureFromServer(self, primaryBoxes, parameters, kwargs):
                 outDict[boxName] = plm_box_id[0].getBoxStructure(True)
             else:
                 notFoundBoxes.append(boxName)
-
-        return (outDict, notFoundBoxes)
+        return outDict, notFoundBoxes
 
     def getBoxStructure(self, primary=False):
         """
@@ -689,6 +703,7 @@ def getBoxStructure(self, primary=False):
                 outDict["documents"][docBrws.engineering_code] = self.getDocDictValues(docBrws)
 
             outDict["entities"] = self.getRelatedEntities(boxBrws)
+            outDict["document_rel"] = self.document_rel.ids
             outDict["description"] = boxBrws.description
             outDict["state"] = boxBrws.engineering_state
             outDict["readonly"] = boxBrws.boxReadonlyCompute()