The British broadcaster engaged in a "serious breach" of broadcasting rules by not revealing that the presenter of a programme about the Gaza conflict was the son of a Hamas administrator, as ruled by British broadcasting authority Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has concluded that the documentary was "materially misleading".
The head of the BBC had earlier expressed regret, noting there had been "a serious error in relation to factual correctness".
The regulator has ordered the broadcaster to air a evening announcement about its findings.
"As this represents a serious breach of our regulations, we are directing the corporation to air a statement of our conclusions against it on BBC Two at 21:00, with a schedule to be finalised," it said.
'Risk to Undermine Trust'
The regulator's report declared: "Our investigation determined that the film's omission to reveal that the narrator's male guardian held a role in the Hamas-controlled administration was significantly deceptive.
"This implied that the viewers did not have critical information which may have been very significant to their assessment of the voice and the content he presented.
"Confidence is at the heart of the connection between a broadcaster and its viewers, particularly for a public service broadcaster such as the BBC.
"This failing had the possibility to undermine the very considerable levels of trust that audiences would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The programme was pulled from the online platform in the month of February after the boy's familial connections were revealed, and in the month of July an internal BBC review concluded it breached the corporation's editorial guidelines on factual correctness.
A representative for the broadcaster said: "The Ofcom ruling is in agreement with the conclusions of Peter Johnston's review, that there was a significant failing in the film in relation to the corporation's content standards on accuracy, which reflects Rule 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we agree with the regulator's ruling in full. We will comply with the penalty as soon as the timing and wording are determined."
