The British broadcaster committed a "major breach" of industry standards by not revealing that the narrator of a programme about the Gaza situation was the child of a Hamas official, as determined by UK media regulator Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the programme was "materially misleading".
The head of the BBC had previously apologised, stating there had been "a major oversight in relation to truthfulness".
The authority has directed the BBC to air a peak-time announcement about its decisions.
"As this represents a significant violation of our regulations, we are instructing the broadcaster to broadcast a announcement of our determinations against it on the BBC's second channel at 21:00, with a schedule to be determined," it said.
'Risk to Undermine Confidence'
The authority's report declared: "The inquiry we conducted concluded that the programme's failure to disclose that the voice's male guardian served in a role in the Hamas-administered authority was significantly deceptive.
"Consequently that the viewers did not have vital facts which may have been extremely pertinent to their assessment of the narrator and the information he presented.
"Confidence is at the core of the bond between a media organization and its audience, notably for a national broadcasting corporation such as the public broadcaster.
"This oversight had the risk to erode the significantly high degrees of trust that viewers would have placed in a BBC factual programme about the conflict in Gaza."
The film was withdrawn from the BBC's streaming service in February after the boy's familial connections emerged, and in July an internal BBC review found it infringed the corporation's content policies on factual correctness.
A corporation official said: "The regulator's decision is in accordance with the results of the internal assessment, that there was a serious error in the film in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with clause 2.2 of the regulator's media standards.
"We issued an apology for this and we accept the regulator's ruling in full. We will adhere to the penalty as soon as the schedule and language are determined."
