>The record is not
deleted. The fields be updated have regular indexes. The field for which I get the error message has a candidate index.
The idea here is not that you are currently working on a deleted record, but that another, deleted, record may have the same key value.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)