The public service broadcaster committed a "major breach" of media regulations by not revealing that the presenter of a documentary about Gaza was the son of a Hamas representative, as ruled by regulatory body Ofcom.
An inquiry by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The head of the BBC had previously apologised, saying there had been "a serious error in relation to truthfulness".
Ofcom has ordered the corporation to transmit a peak-time declaration about its conclusions.
"Since this amounts to a major infringement of our regulations, we are ordering the BBC to air a announcement of our findings against it on BBC2 at 9pm, with a timing to be finalised," the statement read.
'Risk to Undermine Confidence'
The watchdog's report said: "Our investigation concluded that the programme's omission to reveal that the narrator's father held a position in the Hamas-controlled authority was significantly deceptive.
"This implied that the public did not have essential details which may have been highly relevant to their evaluation of the narrator and the information he presented.
"Confidence is at the heart of the bond between a broadcaster and its public, notably for a state-funded media outlet such as the public broadcaster.
"This failing had the potential to undermine the exceptionally strong levels of trust that the public would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was pulled from the online platform in last February after the narrator's personal associations were revealed, and in July an corporation's own inquiry concluded it breached the broadcaster's journalistic standards on accuracy.
A representative for the broadcaster stated: "The authority's determination is in line with the results of the corporation's inquiry, that there was a significant failing in the programme in relation to the broadcaster's journalistic policies on factual correctness, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept the regulator's ruling in its entirety. We will adhere to the sanction as soon as the schedule and wording are confirmed."
