diff --git a/erpnext/patches/v13_0/add_doctype_to_sla.py b/erpnext/patches/v13_0/add_doctype_to_sla.py
index 5f5974f65d..2d3b0de5b5 100644
--- a/erpnext/patches/v13_0/add_doctype_to_sla.py
+++ b/erpnext/patches/v13_0/add_doctype_to_sla.py
@@ -14,7 +14,8 @@ def execute():
 
 	for sla in frappe.get_all("Service Level Agreement"):
 		agreement = frappe.get_doc("Service Level Agreement", sla.name)
-		agreement.document_type = "Issue"
+		agreement.db_set("document_type", "Issue")
+		agreement.reload()
 		agreement.apply_sla_for_resolution = 1
 		agreement.append("sla_fulfilled_on", {"status": "Resolved"})
 		agreement.append("sla_fulfilled_on", {"status": "Closed"})