The British broadcaster committed a "major breach" of industry standards by failing to disclose that the presenter of a programme about Gaza was the son of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has concluded that the programme was "materially misleading".
The BBC's director general had previously apologised, saying there had been "a significant failing in relation to accuracy".
The regulator has directed the corporation to air a evening announcement about its decisions.
"Since this amounts to a serious breach of our rules, we are directing the corporation to broadcast a announcement of our conclusions against it on BBC2 at 21:00, with a schedule to be finalised," the statement read.
'Potential to Damage Trust'
The regulator's announcement stated: "The inquiry we conducted found that the programme's omission to reveal that the voice's father held a role in the Hamas-administered administration was substantially inaccurate.
"Consequently that the audience did not have essential details which may have been very significant to their assessment of the narrator and the information he provided.
"Credibility is at the heart of the relationship between a broadcaster and its audience, especially for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the possibility to erode the very considerable levels of confidence that the public would have invested in a factual film from the broadcaster about the conflict in Gaza."
The film was removed from the online platform in February after the narrator's personal associations emerged, and in July an broadcaster's internal assessment found it breached the organization's journalistic standards on truthfulness.
A corporation official said: "The Ofcom ruling is in accordance with the findings of Peter Johnston's review, that there was a significant failing in the documentary in relation to the corporation's content standards on factual correctness, which corresponds to regulation 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we accept Ofcom's decision in full. We will comply with the directive as soon as the schedule and wording are determined."
