R12.1.1 : When trying to apply patch 16234039 workers failed with ORA-01430 column exists in the tar

Hi,

When trying to apply patch 16234039 workers failed with ORA-01430 column exists in the target database

the log file is showing :
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When trying to apply patch 16234039 workers failed with ORA-01430 column exists in the target database

INFO: An additional column INVOICE_DATE exists in the target database

INFO: An additional column INVOICE_DESCRIPTION exists in the target database

INFO: An additional column INVOICE_NUM exists in the target database

The table IBY_PYO_INVOICE_GT is missing the column INVOICE_NUM

Executing statement  

ALTER TABLE APPS.IBY_PYO_INVOICE_GT ADD ( INVOICE_NUM VARCHAR2(100) NOT NULL  )

Start time for statement above is Wed Jun 12 17:49:29 CEST 2013