The BBC engaged in a "major breach" of media regulations by omitting to mention that the voice of a film about Gaza was the offspring of a Hamas representative, according to British broadcasting authority Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has found that the film was "materially misleading".
The head of the BBC had already issued an apology, stating there had been "a major oversight in relation to factual correctness".
Ofcom has directed the broadcaster to transmit a peak-time announcement about its findings.
"Given this constitutes a significant violation of our regulations, we are instructing the broadcaster to broadcast a statement of our conclusions against it on BBC Two at nine o'clock in the evening, with a timing to be finalised," the regulator stated.
'Potential to Damage Trust'
The regulator's announcement stated: "Our investigation determined that the programme's omission to reveal that the presenter's father held a post in the Hamas-controlled authority was substantially inaccurate.
"Consequently that the audience did not have vital facts which may have been extremely pertinent to their assessment of the presenter and the information he shared.
"Trust is at the core of the bond between a television network and its audience, particularly for a public service broadcaster such as the BBC.
"This oversight had the possibility to erode the very considerable amounts of confidence that viewers would have put in a BBC factual programme about the conflict in Gaza."
The documentary was pulled from iPlayer in February after the narrator's familial connections emerged, and in the month of July an corporation's own inquiry found it violated the broadcaster's editorial guidelines on accuracy.
A representative for the broadcaster commented: "The Ofcom ruling is in accordance with the conclusions of the corporation's inquiry, that there was a serious error in the programme in relation to the broadcaster's journalistic policies on factual correctness, which aligns with regulation 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we accept Ofcom's decision in complete. We will comply with the directive as soon as the date and language are confirmed."
