diff --git a/Dockerfile.synchronizer b/Dockerfile.synchronizer
index ad10365..eb597c9 100644
--- a/Dockerfile.synchronizer
+++ b/Dockerfile.synchronizer
@@ -16,7 +16,7 @@
 
 # xosproject/att-workflow-driver-synchronizer
 
-FROM xosproject/xos-synchronizer-base:2.1.20
+FROM xosproject/xos-synchronizer-base:2.1.21
 
 COPY xos/synchronizer /opt/xos/synchronizers/att-workflow-driver
 COPY VERSION /opt/xos/synchronizers/att-workflow-driver/
diff --git a/VERSION b/VERSION
index 90a27f9..af0b7dd 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.0.5
+1.0.6
diff --git a/xos/synchronizer/models/att-workflow-driver.xproto b/xos/synchronizer/models/att-workflow-driver.xproto
index 233eb00..40fe5d8 100644
--- a/xos/synchronizer/models/att-workflow-driver.xproto
+++ b/xos/synchronizer/models/att-workflow-driver.xproto
@@ -25,7 +25,7 @@
     option verbose_name = "ONU Whitelist";
     option plural = "attworkflowdriverwhitelistentries";
 
-    required manytoone owner->AttWorkflowDriverService:whitelist_entries = 1 [db_index = True, tosca_key=True];
+    required manytoone owner->AttWorkflowDriverService:whitelist_entries = 1:1001 [db_index = True, tosca_key=True];
     required string serial_number = 2 [max_length = 254, db_index = False, tosca_key=True, unique_with = "owner"];
     required int32 pon_port_id = 3 [db_index = False, help_text = "PON Port on which this ONU is expected to show up"];
     required string device_id = 4 [max_length = 54, db_index = False, help_text = "OLT Device (logical device id) on which this ONU is expected to show up"];