The public service broadcaster engaged in a "major breach" of broadcasting rules by not revealing that the voice of a programme about the Gaza conflict was the son of a Hamas official, as ruled by regulatory body Ofcom.
An inquiry by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the programme was "substantially inaccurate".
The chief executive of the broadcaster had earlier expressed regret, stating there had been "a serious error in relation to factual correctness".
Ofcom has ordered the BBC to broadcast a peak-time statement about its decisions.
"Given this constitutes a serious breach of our rules, we are directing the broadcaster to transmit a announcement of our findings against it on BBC Two at nine o'clock in the evening, with a date to be determined," it said.
'Risk to Erode Trust'
The regulator's report declared: "Our probe concluded that the documentary's lack of disclosure that the voice's parent served in a post in the Hamas-controlled authority was materially misleading.
"This implied that the viewers did not have essential details which may have been very significant to their evaluation of the voice and the details he presented.
"Trust is at the center of the relationship between a broadcaster and its public, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the possibility to damage the exceptionally strong degrees of credibility that audiences would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was pulled from iPlayer in February after the boy's familial connections were revealed, and in July an internal BBC review concluded it violated the broadcaster's editorial guidelines on accuracy.
A corporation official said: "The regulator's decision is in agreement with the results of Peter Johnston's review, that there was a major oversight in the programme in relation to the broadcaster's journalistic policies on truthfulness, which aligns with Rule 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the authority's determination in complete. We will adhere to the sanction as soon as the date and wording are confirmed."
