diff --git a/azurerm/internal/services/alertsmanagement/action_rule.go b/azurerm/internal/services/alertsmanagement/action_rule.go
index 1e8888e3efa9..5a122690c7b8 100644
--- a/azurerm/internal/services/alertsmanagement/action_rule.go
+++ b/azurerm/internal/services/alertsmanagement/action_rule.go
@@ -76,12 +76,16 @@ func schemaActionRuleMonitorCondtion() *schema.Schema {
 		}, false),
 	)
 }
+
 func schemaActionRuleMonitorServiceCondtion() *schema.Schema {
 	return schemaActionRuleCondtion(
 		validation.StringInSlice([]string{
 			string(alertsmanagement.Equals),
 			string(alertsmanagement.NotEquals),
 		}, false),
+		// the supported type list is not consistent with the swagger and sdk
+		// https://github.com/Azure/azure-rest-api-specs/issues/9076
+		// directly use string constant
 		validation.StringInSlice([]string{
 			"ActivityLog Administrative",
 			"ActivityLog Autoscale",