MSIR.0330 After SIRFIELD (subcmd), alias (alias1) of field (field1) is no longer produced by PAI because related fieldname (field2) now is
This informational message indicates that a SIRFIELD 'subcmd' command was issued which caused a change in the behaviour of the PAI statement. Prior to this command, the name 'alias1' would be output by a PAI statement, but now it will not be. Instead, any occurrences of this field will be hidden from PAI; only occurrences of the related field 'field2' are output from PAI, and they are output with 'field2' as the name.
See the discussion of the PAI statement in the Sir2000 Field Migration Facility Reference Manual.