The public service broadcaster committed a "significant breach" of broadcasting rules by not revealing that the voice of a documentary about Gaza was the son of a Hamas representative, as ruled by regulatory body Ofcom.
An probe by Ofcom into the documentary titled Gaza: How to Survive a Warzone has determined that the programme was "substantially inaccurate".
The head of the BBC had already issued an apology, stating there had been "a serious error in relation to truthfulness".
The authority has instructed the broadcaster to transmit a peak-time declaration about its decisions.
"As this represents a major infringement of our rules, we are ordering the corporation to transmit a message of our conclusions against it on BBC2 at nine o'clock in the evening, with a date to be finalised," it said.
'Potential to Undermine Credibility'
The watchdog's announcement declared: "The inquiry we conducted found that the film's omission to reveal that the presenter's father served in a role in the Hamas-controlled government was materially misleading.
"This implied that the audience did not have essential details which may have been highly relevant to their evaluation of the voice and the information he presented.
"Confidence is at the core of the relationship between a broadcaster and its audience, particularly for a national broadcasting corporation such as the public broadcaster.
"This failing had the possibility to damage the very considerable levels of credibility that the public would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The film was removed from the online platform in the month of February after the boy's family links came to light, and in July an corporation's own inquiry concluded it breached the broadcaster's editorial guidelines on accuracy.
A representative for the broadcaster said: "The authority's determination is in accordance with the conclusions of the internal assessment, that there was a significant failing in the film in relation to the BBC's Editorial Guidelines on truthfulness, which corresponds to Rule 2.2 of the regulator's media standards.
"We have apologised for this and we accept the authority's determination in complete. We will follow the penalty as soon as the timing and wording are confirmed."
