What is “Filter out” in the output of “verify config” (4298034)

When I issue “verify config” on a config file to validate it, I see a string “Filter out” followed by a DML type (like INSERT, UPDATE or DELETE) as below:

sp_ctrl (alvsupl14:9006)> verify config verifyconfig

  Config verifyconfig is valid

  View detailed config in /home/paul/p9006-11g/var/temp/verifyconfig

[ORA11GR2@alvsupl14]/home/paul/p9006-11g/var/temp> view verifyconfig

  1:  datasource:o.ORA11GR2

  2:

  3:

  4:  #source tables      target tables           routing map

  5:  "PAUL9006"."TABLE1"       "SHA90"."TABLE1"        alvsupu16@o.ORA11GR2

    Filter out >>>>> DELETES

  6:

Here is my config file:

sp_ctrl (alvsupl14:9006)> view config verifyconfig

datasource:o.ORA11GR2

#source tables      target tables           routing map

paul9006.table1 !dml(d) sha90.table1   alvsupu16@o.ORA11GR2