The BBC engaged in a "major breach" of media regulations by failing to disclose that the voice of a film about the Gaza conflict was the son of a Hamas representative, according to regulatory body Ofcom.
An inquiry by the media regulator into the documentary titled Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The chief executive of the broadcaster had earlier expressed regret, noting there had been "a major oversight in relation to factual correctness".
The regulator has directed the BBC to transmit a evening declaration about its conclusions.
"Given this constitutes a major infringement of our regulations, we are instructing the BBC to transmit a statement of our findings against it on BBC2 at 9pm, with a timing to be finalised," the regulator stated.
'Possibility to Erode Trust'
The authority's announcement stated: "Our investigation found that the film's lack of disclosure that the voice's parent held a role in the Hamas-run administration was substantially inaccurate.
"Consequently that the viewers did not have vital facts which may have been extremely pertinent to their evaluation of the presenter and the details he provided.
"Credibility is at the core of the connection between a broadcaster and its public, particularly for a national broadcasting corporation such as the public broadcaster.
"This error had the possibility to undermine the significantly high degrees of trust that the public would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The programme was removed from iPlayer in the month of February after the narrator's familial connections were revealed, and in this past July an internal BBC review concluded it breached the corporation's journalistic standards on accuracy.
A BBC spokesperson said: "The authority's determination is in accordance with the results of Peter Johnston's review, that there was a significant failing in the film in relation to the corporation's content standards on accuracy, which aligns with Rule 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we comply with the regulator's ruling in its entirety. We will follow the sanction as soon as the timing and wording are determined."
