Completely unacceptable. Accuracy is essential, most especially about people's health.
My last job in the NHS was as a typist associated with theatres. There was a form to be completed for each patient - patient details/surgeon/other staff/procedure, etc. Those forms were archived, as they were regarded as a legal document, detailing what was done to whom and who by and who else was present. Sometimes the box for the procedure was left blank; sometimes it was filled in, in advance, but the actual procedure was different (laparoscopic converted to an open, for example). Quite often, the signatures were just vague squiggles, which I'm sure they wouldn't have got away with if they signed their cheques that way.
And yet, every time a patient made a complaint, their theatre form was quickly retrieved, as that was supposed to inform the investigation as to what actually happened.
My job was to type up brief dictations that the surgeon did immediately after each operation. Sometimes I'd get calls from the ward asking for the typed note a.s.a.p.; sometimes I'd get calls from the GP asking for the note to be faxed through. I started off thinking that the operation notes were just a useful add-on, but got to realise that in some cases that was important info for those caring for patients post-op.
The deficiencies were obvious, even to a lowly typist such as myself, but the worst thing was realising it must be obvious to everyone else, but no-one did anything about it.