The BBC committed a "significant breach" of industry standards by omitting to mention that the narrator of a film about the Gaza situation was the child of a Hamas official, as determined by UK media regulator Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the documentary was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, saying there had been "a serious error in relation to factual correctness".
Ofcom has instructed the BBC to broadcast a evening declaration about its decisions.
"Given this constitutes a major infringement of our rules, we are directing the BBC to broadcast a message of our conclusions against it on BBC Two at 9pm, with a date to be confirmed," it said.
'Potential to Erode Confidence'
The watchdog's statement stated: "The inquiry we conducted determined that the film's lack of disclosure that the narrator's male guardian served in a role in the Hamas-controlled government was significantly deceptive.
"It meant that the audience did not have essential details which may have been highly relevant to their assessment of the narrator and the information he presented.
"Confidence is at the core of the bond between a television network and its public, especially for a national broadcasting corporation such as the BBC.
"This oversight had the possibility to damage the very considerable levels of confidence that audiences would have placed in a documentary produced by the BBC about the Gaza conflict."
The film was pulled from the BBC's streaming service in last February after the boy's family links were revealed, and in this past July an corporation's own inquiry found it breached the broadcaster's editorial guidelines on factual correctness.
A representative for the broadcaster said: "The authority's determination is in agreement with the results of Peter Johnston's review, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we accept the regulator's ruling in complete. We will follow the sanction as soon as the timing and wording are finalised."
