The BBC engaged in a "major breach" of broadcasting rules by not revealing that the voice of a programme about Gaza was the son of a Hamas official, according to British broadcasting authority Ofcom.
An probe by the media regulator into the documentary titled Gaza: How to Survive a Warzone has found that the film was "substantially inaccurate".
The chief executive of the broadcaster had already issued an apology, stating there had been "a serious error in relation to truthfulness".
Ofcom has directed the BBC to transmit a peak-time announcement about its conclusions.
"Since this amounts to a serious breach of our regulations, we are instructing the BBC to transmit a statement of our findings against it on the BBC's second channel at 9pm, with a schedule to be finalised," the statement read.
'Possibility to Damage Trust'
The authority's statement said: "Our probe found that the programme's failure to disclose that the narrator's parent held a role in the Hamas-run authority was significantly deceptive.
"This implied that the public did not have critical information which may have been highly relevant to their evaluation of the presenter and the content he shared.
"Confidence is at the core of the bond between a television network and its public, notably for a state-funded media outlet such as the British Broadcasting Corporation.
"This error had the risk to undermine the exceptionally strong amounts of trust that the public would have invested in a documentary produced by the BBC about the Gaza conflict."
The documentary was pulled from iPlayer in last February after the boy's familial connections came to light, and in the month of July an broadcaster's internal assessment found it infringed the organization's content policies on factual correctness.
A BBC spokesperson said: "The Ofcom ruling is in line with the findings of Peter Johnston's review, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on truthfulness, which corresponds to clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we accept the regulator's ruling in complete. We will comply with the sanction as soon as the date and wording are finalised."
