The public service broadcaster engaged in a "serious breach" of media regulations by not revealing that the voice of a film about Gaza was the offspring of a Hamas administrator, according to UK media regulator Ofcom.
An probe by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has concluded that the documentary was "materially misleading".
The BBC's director general had earlier expressed regret, stating there had been "a significant failing in relation to truthfulness".
The regulator has ordered the broadcaster to transmit a evening declaration about its findings.
"Since this amounts to a major infringement of our regulations, we are ordering the corporation to air a announcement of our determinations against it on BBC2 at 21:00, with a date to be determined," the regulator stated.
'Possibility to Undermine Credibility'
The regulator's statement said: "Our investigation found that the documentary's omission to reveal that the presenter's male guardian served in a role in the Hamas-administered government was substantially inaccurate.
"Consequently that the public did not have vital facts which may have been very significant to their judgment of the narrator and the information he provided.
"Trust is at the core of the relationship between a media organization and its public, particularly for a state-funded media outlet such as the BBC.
"This oversight had the risk to erode the exceptionally strong levels of credibility that viewers would have placed in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was pulled from iPlayer in February after the narrator's personal associations were revealed, and in the month of July an corporation's own inquiry concluded it breached the organization's content policies on accuracy.
A corporation official said: "The authority's determination is in agreement with the results of the internal assessment, that there was a significant failing in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to clause 2.2 of the regulator's media standards.
"We have apologised for this and we comply with the authority's determination in full. We will comply with the directive as soon as the date and wording are determined."
