The British broadcaster engaged in a "significant breach" of broadcasting rules by omitting to mention that the narrator of a programme about Gaza was the offspring of a Hamas administrator, as ruled by UK media regulator Ofcom.
An inquiry by Ofcom into the programme Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The BBC's director general had already issued an apology, noting there had been "a serious error in relation to truthfulness".
Ofcom has ordered the BBC to transmit a prime-time announcement about its findings.
"Given this constitutes a serious breach of our code, we are directing the BBC to air a announcement of our conclusions against it on BBC Two at 9pm, with a schedule to be determined," the regulator stated.
'Possibility to Erode Confidence'
The watchdog's announcement declared: "Our probe concluded that the documentary's failure to disclose that the narrator's parent held a position in the Hamas-administered authority was substantially inaccurate.
"Consequently that the public did not have vital facts which may have been extremely pertinent to their evaluation of the narrator and the information he shared.
"Trust is at the core of the relationship between a broadcaster and its public, particularly for a public service broadcaster such as the public broadcaster.
"This oversight had the potential to erode the exceptionally strong levels of confidence that the public would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was pulled from iPlayer in February after the boy's personal associations emerged, and in the month of July an broadcaster's internal assessment concluded it breached the corporation's journalistic standards on truthfulness.
A representative for the broadcaster said: "The authority's determination is in line with the conclusions of the corporation's inquiry, that there was a major oversight in the film in relation to the corporation's content standards on truthfulness, which aligns with clause 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we comply with the authority's determination in full. We will comply with the penalty as soon as the timing and language are finalised."
