The BBC committed a "major breach" of media regulations by failing to disclose that the narrator of a programme about the Gaza conflict was the offspring of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An probe by the media regulator into the documentary titled Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The head of the BBC had already issued an apology, saying there had been "a significant failing in relation to truthfulness".
The authority has instructed the BBC to transmit a peak-time declaration about its decisions.
"Since this amounts to a serious breach of our regulations, we are instructing the broadcaster to transmit a statement of our conclusions against it on BBC2 at 21:00, with a schedule to be finalised," the statement read.
'Potential to Erode Trust'
The authority's report said: "The inquiry we conducted concluded that the programme's lack of disclosure that the narrator's male guardian held a post in the Hamas-run government was substantially inaccurate.
"This implied that the viewers did not have critical information which may have been highly relevant to their evaluation of the presenter and the details he shared.
"Confidence is at the center of the relationship between a television network and its public, particularly for a national broadcasting corporation such as the public broadcaster.
"This error had the risk to erode the significantly high degrees of credibility that audiences would have put in a factual film from the broadcaster about the Gaza conflict."
The programme was pulled from iPlayer in last February after the presenter's personal associations emerged, and in the month of July an corporation's own inquiry concluded it violated the broadcaster's editorial guidelines on accuracy.
A representative for the broadcaster stated: "The regulator's decision is in agreement with the conclusions of the internal assessment, that there was a serious error in the programme in relation to the broadcaster's journalistic policies on accuracy, which corresponds to Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with the regulator's ruling in full. We will follow the directive as soon as the schedule and language are confirmed."
