The public service broadcaster committed a "significant breach" of media regulations by not revealing that the voice of a film about the Gaza situation was the son of a Hamas administrator, as determined by British broadcasting authority Ofcom.
An inquiry by the broadcasting watchdog into Gaza: How to Survive a Warzone has determined that the programme was "significantly deceptive".
The BBC's director general had previously apologised, noting there had been "a serious error in relation to factual correctness".
Ofcom has instructed the BBC to broadcast a prime-time statement about its decisions.
"As this represents a serious breach of our regulations, we are instructing the corporation to air a message of our determinations against it on BBC2 at 21:00, with a date to be determined," the statement read.
'Possibility to Undermine Credibility'
The authority's statement stated: "Our probe found that the film's lack of disclosure that the presenter's male guardian held a position in the Hamas-run authority was significantly deceptive.
"Consequently that the viewers did not have critical information which may have been highly relevant to their evaluation of the voice and the content he presented.
"Confidence is at the center of the relationship between a broadcaster and its viewers, especially for a public service broadcaster such as the public broadcaster.
"This oversight had the possibility to undermine the very considerable degrees of confidence that viewers would have put in a factual film from the broadcaster about the Gaza conflict."
The programme was withdrawn from iPlayer in last February after the boy's familial connections were revealed, and in July an corporation's own inquiry determined it violated the corporation's editorial guidelines on accuracy.
A corporation official commented: "The regulator's decision is in agreement with the results of the corporation's inquiry, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with Ofcom's decision in full. We will follow the penalty as soon as the schedule and wording are determined."
