The BBC engaged in a "significant breach" of industry standards by omitting to mention that the voice of a film about the Gaza conflict was the son of a Hamas administrator, according to UK media regulator Ofcom.
An investigation by Ofcom into the documentary titled Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The chief executive of the broadcaster had already issued an apology, stating there had been "a major oversight in relation to accuracy".
The regulator has instructed the broadcaster to air a evening declaration about its findings.
"Since this amounts to a significant violation of our code, we are instructing the BBC to transmit a announcement of our findings against it on BBC2 at 21:00, with a date to be confirmed," it said.
'Potential to Undermine Credibility'
The regulator's announcement said: "Our probe found that the programme's omission to reveal that the voice's male guardian served in a position in the Hamas-run authority was significantly deceptive.
"It meant that the audience did not have critical information which may have been extremely pertinent to their assessment of the narrator and the information he shared.
"Confidence is at the heart of the relationship between a television network and its viewers, especially for a national broadcasting corporation such as the BBC.
"This error had the possibility to erode the significantly high degrees of trust that audiences would have invested in a BBC factual programme about the Israel-Gaza war."
The documentary was withdrawn from iPlayer in last February after the narrator's personal associations came to light, and in the month of July an corporation's own inquiry determined it infringed the corporation's journalistic standards on factual correctness.
A BBC spokesperson commented: "The authority's determination is in line with the results of the internal assessment, that there was a serious error in the programme in relation to the corporation's content standards on factual correctness, which corresponds to regulation 2.2 of the regulator's media standards.
"We issued an apology for this and we comply with Ofcom's decision in complete. We will comply with the directive as soon as the timing and language are confirmed."
