When we upgrade ODL from Fluorine to Sodium, the following two features are now mandatory to be installed with the OF Plugin, which in Fluorine were not needed:
 
odl-openflowplugin-app-reconciliation-framework
odl-openflowplugin-app-arbitratorreconciliation
 
If these are not enabled, the OFP does not create an entry in the inventory-operational on device connection.  
This is the scenario when disable-reconciliation=true.