diff --git a/tosca-configs/att-workflow/bbwf-adtran-olt.yaml b/tosca-configs/att-workflow/bbwf-adtran-olt.yaml
index 5e6efca..666ab42 100755
--- a/tosca-configs/att-workflow/bbwf-adtran-olt.yaml
+++ b/tosca-configs/att-workflow/bbwf-adtran-olt.yaml
@@ -41,6 +41,7 @@
         outer_tpid: "0x8100"
         uplink: "1"
         nas_id: "NAS_ID"
+        serial_number: "fill-me-in"
       requirements:
         - volt_service:
             node: service#volt