The public service broadcaster engaged in a "significant breach" of broadcasting rules by not revealing that the presenter of a programme about the Gaza conflict was the offspring of a Hamas official, according to regulatory body Ofcom.
An inquiry by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the film was "substantially inaccurate".
The head of the BBC had already issued an apology, saying there had been "a major oversight in relation to factual correctness".
The authority has directed the broadcaster to transmit a peak-time statement about its decisions.
"Since this amounts to a serious breach of our regulations, we are ordering the corporation to air a announcement of our findings against it on BBC2 at 9pm, with a schedule to be finalised," the statement read.
'Potential to Erode Confidence'
The authority's statement said: "Our investigation determined that the programme's lack of disclosure that the presenter's father served in a role in the Hamas-run government was significantly deceptive.
"It meant that the public did not have essential details which may have been extremely pertinent to their judgment of the voice and the details he presented.
"Credibility is at the center of the bond between a broadcaster and its viewers, notably for a public service broadcaster such as the British Broadcasting Corporation.
"This error had the potential to undermine the very considerable degrees of credibility that audiences would have placed in a documentary produced by the BBC about the Gaza conflict."
The film was withdrawn from the online platform in last February after the presenter's familial connections were revealed, and in this past July an broadcaster's internal assessment found it violated the organization's journalistic standards on truthfulness.
A representative for the broadcaster commented: "The Ofcom ruling is in line with the conclusions of the corporation's inquiry, that there was a major oversight 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 have apologised for this and we comply with Ofcom's decision in its entirety. We will adhere to the sanction as soon as the timing and wording are confirmed."