The BBC engaged in a "major breach" of industry standards by omitting to mention 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 the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The head of the BBC had already issued an apology, stating there had been "a major oversight in relation to factual correctness".
Ofcom has ordered the corporation to broadcast a evening declaration about its decisions.
"As this represents a significant violation of our regulations, we are directing the broadcaster to transmit a announcement of our determinations against it on BBC Two at nine o'clock in the evening, with a timing to be finalised," the statement read.
'Potential to Undermine Trust'
The watchdog's report declared: "Our probe found that the programme's omission to reveal that the presenter's father occupied a position in the Hamas-run government was significantly deceptive.
"It meant that the audience did not have essential details which may have been very significant to their evaluation of the voice and the content he shared.
"Confidence is at the core of the connection between a media organization and its audience, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the possibility to damage the exceptionally strong amounts of trust that the public would have put in a documentary produced by the BBC about the Israel-Gaza war."
The programme was withdrawn from iPlayer in the month of February after the narrator's familial connections came to light, and in the month of July an internal BBC review found it infringed the corporation's journalistic standards on accuracy.
A BBC spokesperson stated: "The Ofcom ruling is in line with the results of the internal assessment, that there was a serious error in the documentary in relation to the corporation's content standards on factual correctness, which corresponds to Rule 2.2 of the regulator's media standards.
"We have apologised for this and we agree with Ofcom's decision in its entirety. We will comply with the directive as soon as the date and language are confirmed."
