diff --git a/sdks/pcmscheduler/models.go b/sdks/pcmscheduler/models.go
index e18f0b6..cd0b189 100644
--- a/sdks/pcmscheduler/models.go
+++ b/sdks/pcmscheduler/models.go
@@ -31,6 +31,7 @@ const (
 
 	PackageTypeNormal = "normal"
 	PackageTypeNull   = "null"
+	Null              = "null"
 
 	OrderByName = "name"
 	OrderBySize = "size"