The public service broadcaster engaged in a "significant breach" of broadcasting rules by failing to disclose that the narrator of a film about Gaza was the offspring of a Hamas administrator, as ruled by regulatory body Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The BBC's director general had previously apologised, noting there had been "a significant failing in relation to factual correctness".
The regulator has directed the corporation to air a evening announcement about its decisions.
"As this represents a significant violation of our rules, we are instructing the corporation to air a message of our findings against it on BBC Two at nine o'clock in the evening, with a date to be confirmed," the statement read.
'Risk to Erode Trust'
The authority's announcement declared: "Our probe determined that the documentary's omission to reveal that the presenter's parent held a role in the Hamas-run government was significantly deceptive.
"This implied that the public did not have critical information which may have been extremely pertinent to their judgment of the voice and the content he presented.
"Credibility is at the center of the bond between a broadcaster and its public, particularly for a public service broadcaster such as the BBC.
"This failing had the possibility to damage the exceptionally strong levels of credibility that audiences would have placed in a factual film from the broadcaster about the conflict in Gaza."
The documentary was removed from iPlayer in last February after the narrator's personal associations came to light, and in the month of July an broadcaster's internal assessment found it breached the broadcaster's content policies on factual correctness.
A corporation official commented: "The authority's determination is in accordance with the findings of Peter Johnston's review, that there was a serious error in the documentary in relation to the broadcaster's journalistic policies on accuracy, which reflects Rule 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we agree with Ofcom's decision in full. We will adhere to the penalty as soon as the timing and language are confirmed."
