The public service broadcaster engaged in a "significant breach" of media regulations by omitting to mention that the narrator of a programme about the Gaza situation was the son of a Hamas administrator, according to regulatory body Ofcom.
An inquiry by the media regulator into the documentary titled Gaza: How to Survive a Warzone has found that the documentary was "materially misleading".
The BBC's director general had earlier expressed regret, noting there had been "a serious error in relation to truthfulness".
The authority has instructed the broadcaster to broadcast a peak-time statement about its findings.
"Given this constitutes a serious breach of our regulations, we are instructing the BBC to air a announcement of our determinations against it on the BBC's second channel at 21:00, with a timing to be determined," the statement read.
'Possibility to Erode Trust'
The regulator's announcement declared: "The inquiry we conducted determined that the film's lack of disclosure that the voice's male guardian served in a post in the Hamas-administered government was materially misleading.
"This implied that the public did not have essential details which may have been very significant to their assessment of the voice and the content he presented.
"Confidence is at the heart of the bond between a broadcaster and its audience, especially for a national broadcasting corporation such as the British Broadcasting Corporation.
"This error had the possibility to undermine the significantly high degrees of trust that viewers would have invested in a BBC factual programme about the Gaza conflict."
The programme was pulled from the online platform in the month of February after the presenter's familial connections came to light, and in this past July an corporation's own inquiry concluded it breached the broadcaster's journalistic standards on accuracy.
A corporation official said: "The authority's determination is in accordance with the results of the internal assessment, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with Ofcom's decision in complete. We will follow the sanction as soon as the date and wording are determined."
