The public service broadcaster committed a "significant breach" of industry standards by not revealing that the narrator of a programme about the Gaza conflict was the offspring of a Hamas official, as ruled by British broadcasting authority Ofcom.
An investigation by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the film was "materially misleading".
The chief executive of the broadcaster had already issued an apology, stating there had been "a major oversight in relation to truthfulness".
The regulator has ordered the broadcaster to transmit a evening declaration about its conclusions.
"Since this amounts to a significant violation of our regulations, we are instructing the broadcaster to transmit a announcement of our findings against it on the BBC's second channel at 21:00, with a timing to be confirmed," the regulator stated.
'Risk to Damage Confidence'
The authority's announcement declared: "Our investigation determined that the film's lack of disclosure that the presenter's parent occupied a position in the Hamas-controlled authority was materially misleading.
"Consequently that the viewers did not have essential details which may have been extremely pertinent to their assessment of the presenter and the details he shared.
"Trust is at the center of the connection between a broadcaster and its public, especially for a public service broadcaster such as the BBC.
"This error had the potential to erode the exceptionally strong amounts of confidence that audiences would have placed in a documentary produced by the BBC about the conflict in Gaza."
The film was removed from iPlayer in February after the presenter's family links were revealed, and in the month of July an internal BBC review concluded it violated the corporation's editorial guidelines on accuracy.
A corporation official said: "The authority's determination is in accordance with the results of the internal assessment, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on factual correctness, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we accept the authority's determination in complete. We will adhere to the sanction as soon as the timing and wording are confirmed."
