The BBC engaged in a "serious breach" of media regulations by not revealing that the voice of a programme about Gaza was the son of a Hamas official, as determined by UK media regulator Ofcom.
An probe by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The head of the BBC had earlier expressed regret, stating there had been "a major oversight in relation to truthfulness".
The regulator has instructed the broadcaster to transmit a peak-time statement about its conclusions.
"As this represents a significant violation of our regulations, we are directing the broadcaster to air a statement of our conclusions against it on BBC2 at nine o'clock in the evening, with a schedule to be confirmed," the statement read.
'Potential to Erode Confidence'
The watchdog's report stated: "Our probe determined that the film's omission to reveal that the voice's parent served in a position in the Hamas-run administration was significantly deceptive.
"This implied that the viewers did not have essential details which may have been extremely pertinent to their evaluation of the narrator and the details he presented.
"Confidence is at the heart of the relationship between a media organization and its audience, particularly for a public service broadcaster such as the public broadcaster.
"This oversight had the possibility to undermine the exceptionally strong degrees of confidence that the public would have placed in a factual film from the broadcaster about the Israel-Gaza war."
The programme was pulled from the online platform in February after the boy's familial connections came to light, and in this past July an broadcaster's internal assessment concluded it infringed the organization's journalistic standards on truthfulness.
A BBC spokesperson commented: "The authority's determination is in line with the conclusions of the internal assessment, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we agree with the regulator's ruling in its entirety. We will adhere to the directive as soon as the schedule and wording are confirmed."
