MSIR.0341 SIRFIELD DELETE not allowed for alias which is current PAI name

This message indicates that a SIRFIELD DELETE command was issued, and that the command could not succeed because the alias you attempted to delete is currently the PAI name for a family of names.

If you wish to delete the alias, you must precede this command with a SIRFIELD 'name2' SET PAI command, where 'name2' is another name in the same family as the alias you wish to delete. 

See the discussion of families in the Sir2000 Field Migration Facility Reference Manual. 

The command is rejected.