The British broadcaster was found to have committed a "serious breach" of broadcasting rules by not revealing that the narrator of a programme about Gaza was the offspring 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 documentary was "significantly deceptive".
The head of the BBC had already issued an apology, stating there had been "a serious error in relation to accuracy".
The authority has instructed the broadcaster to air a evening declaration about its conclusions.
"As this represents a significant violation of our regulations, we are instructing the broadcaster to broadcast a message of our findings against it on BBC2 at 9pm, with a schedule to be confirmed," the statement read.
'Potential to Erode Trust'
The watchdog's report said: "The inquiry we conducted determined that the film's lack of disclosure that the voice's father served in a position in the Hamas-run authority was materially misleading.
"This implied that the viewers did not have essential details which may have been extremely pertinent to their judgment of the narrator and the details he presented.
"Credibility is at the center of the connection between a broadcaster and its viewers, notably for a public service broadcaster such as the public broadcaster.
"This error had the possibility to undermine the significantly high levels of confidence that the public would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The programme was pulled from iPlayer in the month of February after the narrator's personal associations were revealed, and in the month of July an broadcaster's internal assessment found it infringed the corporation's editorial guidelines on accuracy.
A BBC spokesperson stated: "The Ofcom ruling is in agreement with the results of the corporation's inquiry, that there was a serious error in the documentary in relation to the corporation's content standards on accuracy, which aligns with clause 2.2 of the regulator's media standards.
"We expressed regret for this and we comply with Ofcom's decision in its entirety. We will comply with the sanction as soon as the timing and wording are confirmed."
