The public service broadcaster was found to have committed a "significant breach" of industry standards by not revealing that the narrator of a documentary about the Gaza situation was the child of a Hamas administrator, as ruled by regulatory body Ofcom.
An probe by Ofcom into Gaza: How to Survive a Warzone has found that the film was "significantly deceptive".
The head of the BBC had earlier expressed regret, saying there had been "a significant failing in relation to accuracy".
Ofcom has instructed the corporation to air a prime-time announcement about its conclusions.
"Since this amounts to a significant violation of our code, we are instructing the BBC to air a announcement of our findings against it on BBC Two at nine o'clock in the evening, with a date to be determined," the regulator stated.
'Risk to Undermine Trust'
The authority's announcement said: "Our investigation concluded that the documentary's failure to disclose that the narrator's father served in a role in the Hamas-administered administration was significantly deceptive.
"Consequently that the viewers did not have critical information which may have been very significant to their evaluation of the narrator and the content he presented.
"Confidence is at the center of the connection between a media organization and its audience, especially for a national broadcasting corporation such as the public broadcaster.
"This oversight had the risk to erode the very considerable levels of credibility that the public would have invested in a BBC factual programme about the Gaza conflict."
The programme was withdrawn from the online platform in last February after the boy's family links emerged, and in this past July an internal BBC review found it infringed the organization's journalistic standards on factual correctness.
A BBC spokesperson stated: "The Ofcom ruling is in agreement with the conclusions of the internal assessment, that there was a serious error in the film in relation to the corporation's content standards on truthfulness, which reflects regulation 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we comply with the regulator's ruling in its entirety. We will comply with the penalty as soon as the date and wording are confirmed."
