The BBC engaged in a "major breach" of broadcasting rules by not revealing that the voice of a programme about the Gaza situation was the offspring of a Hamas administrator, according to regulatory body Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has concluded that the programme was "substantially inaccurate".
The chief executive of the broadcaster had already issued an apology, saying there had been "a significant failing in relation to truthfulness".
The regulator has ordered the BBC to broadcast a peak-time announcement about its conclusions.
"Since this amounts to a major infringement of our rules, we are ordering the corporation to transmit a message of our findings against it on BBC Two at 21:00, with a schedule to be determined," the regulator stated.
'Possibility to Undermine Credibility'
The watchdog's statement declared: "Our investigation determined that the film's failure to disclose that the narrator's parent occupied a position in the Hamas-controlled authority was significantly deceptive.
"It meant that the viewers did not have vital facts which may have been very significant to their evaluation of the presenter and the content he shared.
"Trust is at the core of the relationship between a broadcaster and its public, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the possibility to erode the exceptionally strong levels of trust that viewers would have placed in a BBC factual programme about the Gaza conflict."
The programme was withdrawn from the online platform in the month of February after the presenter's personal associations were revealed, and in the month of July an internal BBC review concluded it breached the corporation's journalistic standards on factual correctness.
A representative for the broadcaster stated: "The regulator's decision is in line with the results of Peter Johnston's review, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we comply with the regulator's ruling in its entirety. We will comply with the sanction as soon as the date and wording are finalised."
