The BBC was found to have committed a "serious breach" of industry standards by omitting to mention that the narrator of a documentary about Gaza was the son of a Hamas official, according to UK media regulator Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The chief executive of the broadcaster had already issued an apology, saying there had been "a significant failing in relation to accuracy".
The authority has instructed the BBC to broadcast a peak-time declaration about its decisions.
"Given this constitutes a serious breach of our rules, we are instructing the broadcaster to transmit a statement of our determinations against it on BBC Two at nine o'clock in the evening, with a timing to be confirmed," the statement read.
'Possibility to Erode Credibility'
The authority's statement declared: "The inquiry we conducted concluded that the film's failure to disclose that the narrator's male guardian held a position in the Hamas-administered government was materially misleading.
"Consequently that the viewers did not have critical information which may have been extremely pertinent to their assessment of the voice and the information he presented.
"Trust is at the heart of the relationship between a broadcaster and its public, especially for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the possibility to undermine the significantly high amounts of trust that audiences would have invested in a documentary produced by the BBC about the conflict in Gaza."
The documentary was pulled from iPlayer in the month of February after the boy's personal associations came to light, and in the month of July an corporation's own inquiry found it violated the corporation's editorial guidelines on truthfulness.
A representative for the broadcaster said: "The Ofcom ruling is in agreement with the findings of Peter Johnston's review, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on accuracy, which reflects regulation 2.2 of the regulator's media standards.
"We issued an apology for this and we accept the regulator's ruling in its entirety. We will adhere to the penalty as soon as the schedule and wording are determined."