The British broadcaster engaged in a "significant breach" of broadcasting rules by omitting to mention that the presenter of a programme about the Gaza conflict was the offspring of a Hamas administrator, as ruled by UK media regulator Ofcom.
An probe by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The BBC's director general had earlier expressed regret, saying there had been "a major oversight in relation to accuracy".
The regulator has directed the BBC to broadcast a peak-time announcement about its decisions.
"As this represents a major infringement of our regulations, we are ordering the BBC to air a statement of our findings against it on BBC Two at 9pm, with a date to be finalised," it said.
'Potential to Damage Confidence'
The regulator's statement stated: "Our probe determined that the documentary's lack of disclosure that the voice's parent held a position in the Hamas-run authority was substantially inaccurate.
"Consequently that the public did not have vital facts which may have been very significant to their assessment of the presenter and the information he presented.
"Confidence is at the heart of the relationship between a broadcaster and its public, especially for a public service broadcaster such as the BBC.
"This oversight had the potential to erode the exceptionally strong amounts of trust that audiences would have placed in a documentary produced by the BBC about the conflict in Gaza."
The film was pulled from iPlayer in the month of February after the narrator's family links were revealed, and in July an broadcaster's internal assessment found it violated the broadcaster's journalistic standards on accuracy.
A corporation official said: "The authority's determination is in line with the findings of the internal assessment, that there was a major oversight in the programme in relation to the broadcaster's journalistic policies on factual correctness, which reflects Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we comply with the authority's determination in its entirety. We will adhere to the sanction as soon as the schedule and wording are finalised."
