Cstaccr.sql and cstcacc.odf fail on upgrade from 11.5.10 to R12.1

@/app/dev/apps/apps_st/appl/bom/12

VPC Team member opened this thread for the customer.

cstaccr.sql and cstcacc.odf fail on upgrade from 11.5.10 to R12.1

Problem Description
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Getting the following errors during the R12.1 upgrade patch:

cstcacc.odf version:
# $Header: cstcacc.odf 120.5 2006/05/23 05:51:29 nejain noship $

Error:
CREATE OR REPLACE SYNONYM APPS.CST_ACCRUAL_ACCOUNTS FOR
BOM.CST_ACCRUAL_ACCOUNTS

AD Worker error:
The following ORACLE error:

ORA-00955: name is already used by an existing object

cstaccr.sql version:
/* $Header: cstaccr.sql 120.4 2006/02/06 16:05:24 vtkamath noship $ */

Error:
sqlplus -s APPS/***** @/app/dev/apps/apps_st/appl/bom/12.0.0/patch/115/sql/cstaccr.sql
Connected.
DECLARE
*
ERROR at line 1:
ORA-06501: PL/SQL: program error