The public service broadcaster engaged in a "significant breach" of media regulations by omitting to mention that the narrator of a documentary about Gaza was the son of a Hamas official, according to regulatory body Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has found that the documentary was "substantially inaccurate".
The head of the BBC had earlier expressed regret, saying there had been "a serious error in relation to factual correctness".
Ofcom has directed the broadcaster to air a evening declaration about its findings.
"Given this constitutes a major infringement of our regulations, we are directing the broadcaster to transmit a statement of our findings against it on BBC Two at 9pm, with a date to be finalised," the statement read.
'Possibility to Erode Trust'
The watchdog's report said: "Our probe determined that the programme's failure to disclose that the narrator's male guardian served in a role in the Hamas-administered government was substantially inaccurate.
"This implied that the audience did not have critical information which may have been highly relevant to their assessment of the narrator and the details he shared.
"Confidence is at the center of the bond between a broadcaster and its public, especially for a national broadcasting corporation such as the BBC.
"This oversight had the risk to undermine the significantly high degrees of credibility that viewers would have placed in a documentary produced by the BBC about the conflict in Gaza."
The film was pulled from the online platform in the month of February after the boy's familial connections were revealed, and in this past July an internal BBC review determined it breached the broadcaster's content policies on accuracy.
A BBC spokesperson stated: "The regulator's decision is in agreement with the findings of Peter Johnston's review, that there was a significant failing in the programme in relation to the corporation's content standards on factual correctness, which corresponds to regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept the authority's determination in complete. We will follow the directive as soon as the date and wording are determined."
