The British broadcaster committed a "major breach" of broadcasting rules by failing to disclose that the narrator of a film about the Gaza conflict was the son of a Hamas official, as ruled by regulatory body Ofcom.
An probe by Ofcom into Gaza: How to Survive a Warzone has found that the documentary was "substantially inaccurate".
The BBC's director general had already issued an apology, noting there had been "a serious error in relation to factual correctness".
Ofcom has directed the broadcaster to air a evening announcement about its findings.
"As this represents a major infringement of our code, we are ordering the broadcaster to transmit a statement of our conclusions against it on BBC Two at nine o'clock in the evening, with a timing to be confirmed," the regulator stated.
'Risk to Erode Trust'
The regulator's report stated: "Our probe found that the programme's failure to disclose that the narrator's father held a position in the Hamas-administered administration was substantially inaccurate.
"Consequently that the audience did not have vital facts which may have been extremely pertinent to their assessment of the presenter and the content he shared.
"Confidence is at the center of the bond between a media organization and its audience, especially for a public service broadcaster such as the public broadcaster.
"This error had the potential to erode the very considerable amounts of confidence that audiences would have invested in a factual film from the broadcaster about the Gaza conflict."
The film was removed from iPlayer in the month of February after the boy's personal associations emerged, and in July an internal BBC review concluded it breached the corporation's journalistic standards on truthfulness.
A representative for the broadcaster stated: "The authority's determination is in line with the conclusions of the internal assessment, that there was a significant failing in the documentary in relation to the corporation's content standards on truthfulness, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with Ofcom's decision in its entirety. We will comply with the penalty as soon as the date and wording are confirmed."
