The BBC committed a "major breach" of industry standards by omitting to mention that the voice of a film about the Gaza situation was the son of a Hamas official, as determined by regulatory body Ofcom.
An inquiry by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has found that the documentary was "substantially inaccurate".
The chief executive of the broadcaster had earlier expressed regret, noting there had been "a serious error in relation to factual correctness".
The authority has directed the BBC to transmit a prime-time announcement about its findings.
"Given this constitutes a serious breach of our code, we are instructing the corporation to broadcast a announcement of our conclusions against it on the BBC's second channel at nine o'clock in the evening, with a date to be determined," it said.
'Possibility to Damage Credibility'
The regulator's statement declared: "The inquiry we conducted found that the film's omission to reveal that the voice's father held a position in the Hamas-run government was significantly deceptive.
"Consequently that the audience did not have vital facts which may have been very significant to their assessment of the narrator and the information he shared.
"Confidence is at the center of the bond between a media organization and its public, particularly for a public service broadcaster such as the BBC.
"This failing had the potential to undermine the significantly high amounts of confidence that audiences would have invested in a BBC factual programme about the Israel-Gaza war."
The programme was removed from the BBC's streaming service in February after the presenter's personal associations were revealed, and in this past July an internal BBC review found it violated the broadcaster's content policies on accuracy.
A BBC spokesperson stated: "The authority's determination is in line with the conclusions of the corporation's inquiry, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we comply with Ofcom's decision in full. We will adhere to the sanction as soon as the date and wording are confirmed."
