The public service broadcaster was found to have committed a "significant breach" of industry standards by not revealing that the narrator of a programme about Gaza was the child of a Hamas representative, as determined by regulatory body Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the film was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, stating there had been "a serious error in relation to factual correctness".
The regulator has directed the BBC to transmit a evening announcement about its findings.
"As this represents a significant violation of our code, we are directing the BBC to air a announcement of our conclusions against it on BBC2 at nine o'clock in the evening, with a date to be finalised," the regulator stated.
'Possibility to Undermine Credibility'
The watchdog's statement stated: "The inquiry we conducted determined that the film's omission to reveal that the narrator's father held a role in the Hamas-controlled administration was significantly deceptive.
"It meant that the audience did not have essential details which may have been very significant to their judgment of the narrator and the details he presented.
"Confidence is at the core of the connection between a television network and its audience, particularly for a national broadcasting corporation such as the public broadcaster.
"This failing had the risk to undermine the very considerable levels of trust that viewers would have placed in a factual film from the broadcaster about the conflict in Gaza."
The documentary was pulled from iPlayer in February after the boy's personal associations came to light, and in this past July an corporation's own inquiry concluded it breached the corporation's journalistic standards on factual correctness.
A corporation official said: "The Ofcom ruling is in accordance with the findings of the corporation's inquiry, that there was a major oversight in the programme in relation to the broadcaster's journalistic policies on factual correctness, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with Ofcom's decision in full. We will comply with the sanction as soon as the timing and language are finalised."
