diff --git a/models/booking/planner/planner.go b/models/booking/planner/planner.go
index bf693c5..597d7b3 100644
--- a/models/booking/planner/planner.go
+++ b/models/booking/planner/planner.go
@@ -108,6 +108,9 @@ func generate(request *tools.APIRequest, shallow bool) (*Planner, error) {
 		}
 
 		instanceID, usage, cap := extractSlotData(bk, request)
+		if instanceID == "" {
+			instanceID = bk.InstanceID
+		}
 
 		if cap != nil && instanceID != "" {
 			if p.Capacities[bk.ResourceID] == nil {