R12.1.3 : b14728588.sql failed with ORA-01732: data manipulation operation not legal on this view Er

Hi,
Patch 15843459 Failed with the below Error:

sql $APPL_TOP/po/12.0.0/patch/115/sql/b14728588.sql &un_apps &pw_apps


Start time for statement below is: Wed Oct 16 2013 04:44:33

CONNECT APPS/*****


Start time for statement below is: Wed Oct 16 2013 04:44:33

DROP index PO_REQUISITION_LINES_F5

AD Worker error:
The following ORACLE error:

ORA-00604: error occurred at recursive SQL level 1
ORA-01732: data manipulation operation not legal on this view


occurred while executing the SQL statement:

DROP index PO_REQUISITION_LINES_F5

Error occurred in file

$APPL_TOP/po/12.0.0/patch/115/sql/b14728588.sql

Thank You.