The public service broadcaster committed a "major breach" of industry standards by not revealing that the voice of a programme about Gaza was the son of a Hamas administrator, according to UK media regulator Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The BBC's director general had already issued an apology, stating there had been "a significant failing in relation to factual correctness".
Ofcom has instructed the BBC to broadcast a peak-time declaration about its findings.
"Given this constitutes a significant violation of our code, we are ordering the BBC to air a statement of our determinations against it on BBC Two at 9pm, with a date to be confirmed," the regulator stated.
'Risk to Damage Credibility'
The authority's announcement said: "Our probe determined that the film's omission to reveal that the presenter's parent occupied a position in the Hamas-run administration was substantially inaccurate.
"This implied that the public did not have essential details which may have been extremely pertinent to their judgment of the voice and the information he presented.
"Trust is at the core of the connection between a media organization and its public, particularly for a public service broadcaster such as the BBC.
"This error had the potential to undermine the very considerable degrees of credibility that the public would have invested in a BBC factual programme about the conflict in Gaza."
The documentary was removed from the online platform in last February after the boy's personal associations came to light, and in July an broadcaster's internal assessment concluded it violated the broadcaster's journalistic standards on accuracy.
A representative for the broadcaster commented: "The regulator's decision is in line with the results of the corporation's inquiry, that there was a significant failing in the documentary in relation to the corporation's content standards on accuracy, which reflects Rule 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we accept the regulator's ruling in full. We will follow the sanction as soon as the date and wording are confirmed."
