The BBC was found to have committed a "major breach" of industry standards by omitting to mention that the presenter of a documentary about the Gaza situation was the child of a Hamas official, according to regulatory body Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has determined that the documentary was "substantially inaccurate".
The head of the BBC had already issued an apology, stating there had been "a significant failing in relation to factual correctness".
The authority has instructed the BBC to air a evening announcement about its conclusions.
"Since this amounts to a major infringement of our rules, we are ordering the BBC to air a statement of our determinations against it on BBC2 at 9pm, with a schedule to be confirmed," the statement read.
'Risk to Erode Trust'
The authority's announcement declared: "Our investigation concluded that the documentary's lack of disclosure that the presenter's male guardian served in a post in the Hamas-controlled authority was materially misleading.
"It meant that the public did not have critical information which may have been very significant to their assessment of the presenter and the information he shared.
"Confidence is at the center of the connection between a broadcaster and its audience, particularly for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the possibility to undermine the exceptionally strong levels of confidence that viewers would have placed in a documentary produced by the BBC about the Gaza conflict."
The documentary was withdrawn from iPlayer in last February after the presenter's family links emerged, and in this past July an internal BBC review found it breached the broadcaster's editorial guidelines on truthfulness.
A corporation official said: "The regulator's decision is in line with the results of the corporation's inquiry, that there was a major oversight in the documentary in relation to the corporation's content standards on factual correctness, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept the regulator's ruling in full. We will adhere to the directive as soon as the schedule and wording are confirmed."
