Patch 6678700 : R11i to R12.1.1 Upgrade : Scripts ceburgrp.sql and apstca01.sql fail with "ORA-00001

@/u01/hrupg31/apps/apps_st/appl/ce/12

(Thread created by Oracle Support on behalf of Customer)
Hi there

While upgrading from 11.5.10.2 to 12.1.1 (Patch #6678700) the following
two scripts are failing :

 sqlplus -s APPS/***** @/u01/hrupg31/apps/apps_st/appl/ce/12.0.0/patch/115/sql/ceburgrp.sql
 DECLARE
 *
 ERROR at line 1:
 ORA-00001: unique constraint (AR.HZ_PARTY_SITES_U2) violated
 ORA-06512: at line 3742


 sqlplus -s APPS/***** @/u01/hrupg31/apps/apps_st/appl/ap/12.0.0/patch/115/sql/apstca01.sql &un_ap &batchsize 14 16
 DECLARE
 *
 ERROR at line 1:
 ORA-00001: unique constraint (AR.HZ_PARTY_SITES_U2) violated
 ORA-06512: at line 1157

Thanks
Des