The public service broadcaster engaged in a "serious breach" of broadcasting rules by not revealing that the voice of a documentary about Gaza was the son of a Hamas administrator, as ruled by UK media regulator Ofcom.
An inquiry by Ofcom into Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The chief executive of the broadcaster had already issued an apology, stating there had been "a serious error in relation to accuracy".
Ofcom has instructed the BBC to air a peak-time statement about its conclusions.
"Since this amounts to a serious breach of our rules, we are instructing the corporation to broadcast a statement of our conclusions against it on BBC2 at nine o'clock in the evening, with a date to be confirmed," it said.
'Risk to Undermine Credibility'
The watchdog's announcement declared: "Our probe found that the programme's omission to reveal that the presenter's father occupied a role in the Hamas-controlled authority was materially misleading.
"Consequently that the public did not have essential details which may have been very significant to their assessment of the presenter and the details he shared.
"Credibility is at the heart of the bond between a media organization and its viewers, especially for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the possibility to undermine the exceptionally strong levels of trust that the public would have invested in a factual film from the broadcaster about the conflict in Gaza."
The film was pulled from iPlayer in February after the narrator's familial connections were revealed, and in this past July an corporation's own inquiry concluded it violated the broadcaster's journalistic standards on accuracy.
A representative for the broadcaster commented: "The Ofcom ruling is in line with the conclusions of the corporation's inquiry, that there was a serious error in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which corresponds to clause 2.2 of the regulator's media standards.
"We issued an apology for this and we accept the regulator's ruling in complete. We will adhere to the directive as soon as the timing and language are determined."
