Patch 12909730 is failing on PO tables

Hi All,
On :  12.1.3 version, Patch Application Issues

Patch 12909730 is failing on PO tables  

From the adworker log, the following msgs are noted:

*** Reading objects from PO schema

Reading table PO_REQUISITION_HEADERS_ALL from PO schema ...
Reading table PO_REQUISITION_LINES_ALL from PO schema ...

AD Worker - aduoixrc: ERROR: Failed to find column 'SYS_NC00194$' in table 'PO_REQUISITION_LINES_ALL'
for index 'PO_REQUISITION__IDX$$_F25E001D'

AD Worker - aduotbri2: ERROR: Failed to read column for index 'PO_REQUISITION__IDX$$_F25E001D'
       in table 'PO_REQUISITION_LINES_ALL' from RDBMS

AD Worker - aduobbrt2: ERROR: Failed to read index for table 'PO_REQUISITION_LINES_ALL' from RDBMS