Update file _3gpp-common-managed-element.yang

  import _3gpp-nr-nrm-ecmappingrule { prefix ecmap3gpp ; }

  import _3gpp-stm-nrm-stmfunction { prefix stm3gpp; }

  import _3gpp-nr-nrm-mwab { prefix mwab3gpp; }

  import _3gpp-nr-nrm-iabfunction { prefix iab3gpp; }

  organization "3GPP SA5";

  contact "https://www.3gpp.org/DynaReport/TSG-WG--S5--officials.htm?Itemid=464";

    uses mwab3gpp:MWABSubTree {

      if-feature MWABUnderManagedElement ;

    }

    uses iab3gpp:iabfunctionSubTree {      

    }

  }    

}