Harry:

>apart from 'on error' or 'on error 0' what else must we do to prevent vfp jumping to its error reporting code rather than stopping where we want it stopped - on our offending line of code.
>

You must be running from VFP's foundation classes or a framework in which the ERROR method is populated. VFP out of the box has no error handling in dev mode except to jump to the debugger (for forms) or to bring up the offending code (for PRG's).

Determine what error handler is coming into play and comment it out or make it go away.

Hope this helps.