IDAETERR08 - Invalid update of field

Reason:

A dataview field was updated after the FOR construct was exited.
A dataview field was updated in a FOR construct for which the NO UPDATE clause was specified.
A dataview field was updated in a dataview for which the update is denied in the dataview definition (shows as UPD=NO on the DISPLAY DVW command).

Action:

Correct the condition in your program that caused the error and recompile.