A supported DDL is not replicated to target despite SP_OCT_REPLICATE_DDL set to 3 (4300354)

A supported DDL is not replicated to target despite SP_OCT_REPLICATE_DDL set to 3. The replication is otherwise working fine.  The Capture DDL log states that the DDL has been captured and sent to target:

ocap_ddl 2013-06-27 10:07:12.133942 30771 2444290048 Oracle Time: 06/27/13 10:07:10 object=PITEST.RPTOPENDATA_TEMP

ocap_ddl 2013-06-27 10:07:28.028312 30771 2444290048 User Name: "user_name"                 Status: Replicated (Inferred)

ocap_ddl 2013-06-27 10:07:28.028312 30771 2444290048 DDL = ALTER TABLE owner.table_name ADD (initiator VARCHAR2(20) NULL, extview CHAR(1) DEFAULT 'N' NULL)

The Post DDL log (*opo* *ddl*) also confirms that the DDL is posted:

opo_ddl  2013-06-27 10:07:11.292253 11999 3854641472 s:2 Alter table DDL posted:

opo_ddl  2013-06-27 10:07:11.292328 11999 3854641472 s:2   SQL = "ALTER TABLE owner.table_name ADD (initiator VARCHAR2(20) NULL, extview CHAR(1) DEFAULT 'N' NULL)

But the DDL is not posted.