Oracle Error Message
ORA-16229: PDML child string string string for parent string string string cannot be skipped.
Reason for the Error
A request was made to skip a parallel DML child transaction id. This is not supported.
Solution
Using the DBMS_LOGSTDBY.UNSKIP_TRANSACTION procedure, remove the child transaction id, then specify the parent transaction id using DBMS_LOGSTDBY.SKIP_TRANSACTION if appropriate.