The British broadcaster engaged in a "major breach" of media regulations by failing to disclose that the voice of a programme about the Gaza situation was the son of a Hamas official, as ruled by regulatory body Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The head of the BBC had previously apologised, stating there had been "a significant failing in relation to truthfulness".
The authority has ordered the BBC to broadcast a evening declaration about its decisions.
"Since this amounts to a major infringement of our regulations, we are ordering the broadcaster to broadcast a message of our determinations against it on BBC2 at nine o'clock in the evening, with a timing to be determined," the statement read.
'Risk to Erode Trust'
The watchdog's announcement declared: "Our probe found that the film's failure to disclose that the narrator's parent occupied a position in the Hamas-controlled government was materially misleading.
"It meant that the audience did not have essential details which may have been extremely pertinent to their evaluation of the voice and the content he presented.
"Confidence is at the core of the relationship between a broadcaster and its viewers, especially for a public service broadcaster such as the BBC.
"This error had the potential to damage the exceptionally strong amounts of confidence that the public would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was pulled from iPlayer in last February after the narrator's familial connections emerged, and in July an broadcaster's internal assessment determined it breached the broadcaster's content policies on accuracy.
A corporation official said: "The regulator's decision is in line with the results of the internal assessment, that there was a serious error in the programme in relation to the broadcaster's journalistic policies on accuracy, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept the authority's determination in its entirety. We will adhere to the sanction as soon as the timing and wording are confirmed."
