The BBC engaged in a "major breach" of broadcasting rules by omitting to mention that the narrator of a programme about Gaza was the son of a Hamas administrator, as ruled by regulatory body Ofcom.
An probe by Ofcom into the documentary titled Gaza: How to Survive a Warzone has found that the documentary was "materially misleading".
The BBC's director general had previously apologised, saying there had been "a serious error in relation to factual correctness".
The authority has ordered the BBC to transmit a prime-time announcement about its findings.
"Since this amounts to a significant violation of our rules, we are instructing the BBC to transmit a statement of our conclusions against it on the BBC's second channel at nine o'clock in the evening, with a date to be determined," the statement read.
'Possibility to Undermine Credibility'
The watchdog's report said: "Our probe found that the film's lack of disclosure that the voice's father occupied a post in the Hamas-run administration was materially misleading.
"Consequently that the audience did not have critical information which may have been very significant to their evaluation of the voice and the details he provided.
"Trust is at the core of the relationship between a broadcaster and its public, notably for a national broadcasting corporation such as the BBC.
"This oversight had the risk to erode the exceptionally strong levels of credibility that viewers would have invested in a factual film from the broadcaster about the Gaza conflict."
The programme was pulled from iPlayer in last February after the boy's personal associations emerged, and in July an broadcaster's internal assessment determined it violated the broadcaster's content policies on accuracy.
A BBC spokesperson stated: "The Ofcom ruling is in line with the results of the internal assessment, that there was a serious error in the programme in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to clause 2.2 of the regulator's media standards.
"We issued an apology for this and we accept the regulator's ruling in its entirety. We will comply with the directive as soon as the date and wording are finalised."
