The public service broadcaster engaged in a "major breach" of media regulations by failing to disclose that the narrator of a film about the Gaza conflict was the offspring of a Hamas administrator, as ruled by UK media regulator Ofcom.
An inquiry by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the film was "significantly deceptive".
The chief executive of the broadcaster had already issued an apology, stating there had been "a significant failing in relation to truthfulness".
The authority has ordered the corporation to air a peak-time announcement about its decisions.
"Since this amounts to a major infringement of our code, we are instructing the broadcaster to broadcast a message of our conclusions against it on BBC2 at 21:00, with a schedule to be confirmed," the statement read.
'Possibility to Erode Credibility'
The watchdog's announcement stated: "Our investigation concluded that the programme's omission to reveal that the narrator's father served in a post in the Hamas-administered government was materially misleading.
"This implied that the audience did not have critical information which may have been extremely pertinent to their assessment of the presenter and the details he shared.
"Trust is at the core of the bond between a television network and its audience, especially for a public service broadcaster such as the BBC.
"This error had the potential to erode the significantly high degrees of credibility that the public would have placed in a factual film from the broadcaster about the Gaza conflict."
The programme was pulled from the BBC's streaming service in last February after the presenter's familial connections emerged, and in July an corporation's own inquiry concluded it infringed the organization's content policies on factual correctness.
A representative for the broadcaster stated: "The regulator's decision is in accordance with the conclusions of Peter Johnston's review, that there was a major oversight in the documentary in relation to the corporation's content standards on truthfulness, which corresponds to clause 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we agree with the authority's determination in full. We will comply with the sanction as soon as the date and wording are confirmed."
