The public service broadcaster committed a "significant breach" of broadcasting rules by failing to disclose that the presenter of a film about Gaza was the offspring of a Hamas administrator, according to UK media regulator Ofcom.
An inquiry by Ofcom into the programme Gaza: How to Survive a Warzone has concluded that the programme was "materially misleading".
The chief executive of the broadcaster had earlier expressed regret, saying there had been "a significant failing in relation to truthfulness".
The authority has directed the corporation to air a evening statement about its conclusions.
"Given this constitutes a major infringement of our regulations, we are instructing the corporation to air a statement of our determinations against it on the BBC's second channel at 21:00, with a date to be confirmed," it said.
'Possibility to Undermine Confidence'
The watchdog's report stated: "Our probe concluded that the documentary's omission to reveal that the voice's father occupied a role in the Hamas-controlled authority was significantly deceptive.
"This implied that the public did not have vital facts which may have been extremely pertinent to their evaluation of the voice and the information he provided.
"Trust is at the center of the relationship between a broadcaster and its audience, notably for a state-funded media outlet such as the BBC.
"This error had the possibility to damage the significantly high amounts of confidence that viewers would have put in a documentary produced by the BBC about the conflict in Gaza."
The film was withdrawn from iPlayer in February after the narrator's familial connections came to light, and in this past July an corporation's own inquiry concluded it infringed the organization's journalistic standards on accuracy.
A BBC spokesperson stated: "The regulator's decision is in line with the results of the internal assessment, that there was a significant failing in the programme in relation to the corporation's content standards on factual correctness, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we agree with the authority's determination in its entirety. We will follow the sanction as soon as the timing and language are confirmed."
