The British broadcaster engaged in a "serious breach" of broadcasting rules by omitting to mention that the voice of a film about the Gaza situation was the child of a Hamas administrator, as ruled by regulatory body Ofcom.
An investigation by the broadcasting watchdog into Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The BBC's director general had earlier expressed regret, noting there had been "a serious error in relation to accuracy".
Ofcom has ordered the BBC to broadcast a prime-time declaration about its decisions.
"Given this constitutes a significant violation of our rules, we are directing the corporation to transmit a announcement of our findings against it on BBC Two at 9pm, with a schedule to be finalised," the statement read.
'Possibility to Damage Trust'
The watchdog's announcement said: "Our investigation determined that the programme's failure to disclose that the voice's parent held a role in the Hamas-administered administration was significantly deceptive.
"This implied that the public did not have vital facts which may have been extremely pertinent to their assessment of the voice and the details he presented.
"Confidence is at the center of the relationship between a television network and its viewers, particularly for a public service broadcaster such as the public broadcaster.
"This error had the risk to damage the significantly high degrees of credibility that the public would have placed in a BBC factual programme about the Israel-Gaza war."
The film was pulled from the online platform in February after the narrator's personal associations came to light, and in the month of July an internal BBC review concluded it violated the broadcaster's editorial guidelines on factual correctness.
A corporation official commented: "The Ofcom ruling is in agreement with the conclusions of Peter Johnston's review, that there was a serious error in the programme in relation to the broadcaster's journalistic policies on truthfulness, which corresponds to regulation 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept the regulator's ruling in full. We will adhere to the penalty as soon as the date and wording are confirmed."
