The BBC engaged in a "significant breach" of media regulations by not revealing that the voice of a film about Gaza was the offspring of a Hamas official, as ruled by UK media regulator Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The BBC's director general had already issued an apology, stating there had been "a major oversight in relation to truthfulness".
Ofcom has ordered the broadcaster to broadcast a evening declaration about its decisions.
"As this represents a significant violation of our regulations, we are instructing the corporation to transmit a message of our determinations against it on BBC2 at 9pm, with a date to be determined," the regulator stated.
'Possibility to Damage Credibility'
The authority's announcement said: "The inquiry we conducted determined that the film's omission to reveal that the presenter's male guardian served in a position in the Hamas-controlled authority was materially misleading.
"Consequently that the public did not have critical information which may have been extremely pertinent to their assessment of the presenter and the details he shared.
"Trust is at the core of the bond between a media organization and its public, particularly for a public service broadcaster such as the BBC.
"This failing had the risk to undermine the exceptionally strong levels of credibility that viewers would have placed in a BBC factual programme about the Gaza conflict."
The programme was withdrawn from the online platform in last February after the narrator's familial connections were revealed, and in July an corporation's own inquiry determined it infringed the organization's content policies on truthfulness.
A BBC spokesperson commented: "The regulator's decision is in agreement with the findings of the internal assessment, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which reflects Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we comply with the authority's determination in full. We will adhere to the directive as soon as the schedule and wording are confirmed."
