Is it possible to expand column FND_CONC_PP_ACTIONS.PUBLISHER_RETURN_RESULTS?

in EBS 12.2.5 (XDO 10.1.3.4.2)

From a very large XML data set the BIP process successfully generates the main output file but fails Bursting due to the column FND_CONC_PP_ACTIONS.PUBLISHER_RETURN_RESULTS getting filled up:

APP-FND-01564: ORACLE error 1406 in display_opp_results

Cause: display_opp_results failed due to ORA-01406: fetched column value was truncated.

The SQL statement being executed at the time of the error was:

SELECT ACTION_TYPE, PUBLISHER_RETURN_RESULTS FROM FND_CONC_PP_ACTIONS

There are hundreds of bursting records which eventually overwhelms this column.

The CP Purge program was used on the FND_CONC_PP_ACTIONS but did not relieve this error.