Setting Up Single Datum Reference for Positional Characteristics

[[Do...]]

I have a bracket where I have a positional callout going back to a single datum and am curious as to what the standard practice is for setting this up. Is it something as simple as selecting the hole for the characteristic and then only selecting the opposing single datum hole under the "datum" section. Or is there some sort of specialized alignment that needs to be setup first and then referenced within the characteristic side? Our engineering group has relayed that the intent is to control the hole to the single datum hole only due to the variation that is inherent within the bending process during manufacture of the bracket.

[[Ma...]]

Unfortunately this is wrong selection of datums.

At least one more datum should be required - i would prefer plane where is datum D. Alternatively a perpendicular plane to that plane.

From this sheet you can not have strong datum to such small tolerance over that big distance.
It should be better to ask engineer which of those planes are available to be a datum.

Edited 10 hours ago