The public service broadcaster committed a "major breach" of broadcasting rules by not revealing that the voice of a programme about the Gaza situation was the child of a Hamas official, as ruled by regulatory body Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the documentary was "substantially inaccurate".
The BBC's director general had previously apologised, stating there had been "a serious error in relation to truthfulness".
The authority has ordered the broadcaster to broadcast a peak-time announcement about its conclusions.
"Given this constitutes a serious breach of our code, we are ordering the BBC to air a message of our findings against it on BBC2 at nine o'clock in the evening, with a schedule to be finalised," it said.
The regulator's report stated: "Our investigation concluded that the film's omission to reveal that the narrator's male guardian held a position in the Hamas-run authority was materially misleading.
"It meant that the audience did not have critical information which may have been highly relevant to their assessment of the presenter and the content he provided.
"Trust is at the core of the connection between a broadcaster and its public, notably for a public service broadcaster such as the public broadcaster.
"This oversight had the risk to undermine the very considerable amounts of confidence that audiences would have put in a documentary produced by the BBC about the Israel-Gaza war."
The film was removed from the BBC's streaming service in the month of February after the boy's family links came to light, and in July an broadcaster's internal assessment concluded it infringed the corporation's content policies on factual correctness.
A corporation official stated: "The authority's determination is in accordance with the conclusions of the internal assessment, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we agree with Ofcom's decision in complete. We will follow the penalty as soon as the timing and wording are finalised."
A tech journalist with over a decade of experience covering emerging technologies and digital innovation across global markets.
