The public service broadcaster committed a "significant breach" of broadcasting rules by not revealing that the narrator of a documentary about Gaza was the son of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has found that the programme was "materially misleading".
The BBC's director general had earlier expressed regret, noting there had been "a major oversight in relation to factual correctness".
The authority has directed the BBC to air a evening statement about its decisions.
"Since this amounts to a serious breach of our regulations, we are directing the BBC to broadcast a statement of our findings against it on the BBC's second channel at 21:00, with a timing to be confirmed," it said.
'Possibility to Damage Confidence'
The watchdog's report declared: "Our probe concluded that the programme's lack of disclosure that the presenter's parent served in a position in the Hamas-administered government was substantially inaccurate.
"This implied that the public did not have essential details which may have been extremely pertinent to their evaluation of the narrator and the information he shared.
"Credibility is at the center of the relationship between a media organization and its viewers, especially for a public service broadcaster such as the BBC.
"This error had the possibility to damage the very considerable degrees of trust that audiences would have put in a BBC factual programme about the conflict in Gaza."
The programme was withdrawn from the BBC's streaming service in February after the presenter's family links emerged, and in the month of July an internal BBC review found it breached the corporation's editorial guidelines on accuracy.
A BBC spokesperson stated: "The Ofcom ruling is in accordance with the results of the internal assessment, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on truthfulness, which aligns with Rule 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we comply with the regulator's ruling in its entirety. We will comply with the sanction as soon as the date and wording are confirmed."
