Allow @ov_attach_insert with @ov_priority.
In a load profile you can only use @ov_attach_insert with @ov_action of a, b, c, or e. However it is possible to do an a match and attach with any @ov_action if you use the @ov_priority function. It should be possible to use @ov_attach_insert in that situation as well.
I use @ov_attach_insert on all my match and attach loaders to insert a note field I use in all my records, but I can't use that in the case of @ov_priority loaders because I can't use @ov_attach_insert.