The British broadcaster was found to have committed a "serious breach" of broadcasting rules by omitting to mention that the narrator of a programme about Gaza was the offspring of a Hamas representative, as ruled by regulatory body Ofcom.
An inquiry by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the programme was "materially misleading".
The chief executive of the broadcaster had earlier expressed regret, stating there had been "a major oversight in relation to accuracy".
Ofcom has ordered the broadcaster to transmit a evening announcement about its conclusions.
"As this represents a major infringement of our regulations, we are directing the corporation to transmit a statement of our determinations against it on BBC2 at 21:00, with a date to be determined," it said.
'Possibility to Damage Credibility'
The regulator's statement declared: "Our probe determined that the documentary's failure to disclose that the narrator's male guardian served in a position in the Hamas-administered administration was significantly deceptive.
"Consequently that the viewers did not have vital facts which may have been extremely pertinent to their assessment of the presenter and the content he shared.
"Trust is at the heart of the bond between a broadcaster and its viewers, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This error had the risk to erode the exceptionally strong degrees of credibility that audiences would have placed in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was pulled from the BBC's streaming service in February after the boy's familial connections were revealed, and in the month of July an corporation's own inquiry found it violated the organization's content policies on factual correctness.
A BBC spokesperson stated: "The regulator's decision is in agreement with the conclusions of Peter Johnston's review, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept Ofcom's decision in its entirety. We will comply with the penalty as soon as the date and wording are confirmed."
