The public service broadcaster was found to have committed a "major breach" of media regulations by not revealing that the narrator of a documentary about the Gaza situation was the offspring of a Hamas official, as ruled by British broadcasting authority Ofcom.
An inquiry by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The BBC's director general had earlier expressed regret, noting there had been "a significant failing in relation to accuracy".
Ofcom has ordered the broadcaster to transmit a evening declaration about its decisions.
"Since this amounts to a serious breach of our code, we are instructing the corporation to air a statement of our conclusions against it on BBC Two at 21:00, with a timing to be determined," the statement read.
'Risk to Erode Confidence'
The watchdog's statement said: "Our investigation concluded that the film's lack of disclosure that the voice's parent held a post in the Hamas-run administration was materially misleading.
"This implied that the public did not have critical information which may have been extremely pertinent to their judgment of the narrator and the information he shared.
"Credibility is at the heart of the connection between a television network and its audience, especially for a state-funded media outlet such as the British Broadcasting Corporation.
"This failing had the possibility to erode the exceptionally strong degrees of trust that viewers would have placed in a BBC factual programme about the conflict in Gaza."
The film was removed from the BBC's streaming service in last February after the narrator's personal associations came to light, and in July an internal BBC review concluded it violated the organization's journalistic standards on factual correctness.
A BBC spokesperson stated: "The authority's determination is in agreement with the results of Peter Johnston's review, that there was a serious error in the programme in relation to the corporation's content standards on accuracy, which reflects regulation 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we comply with the regulator's ruling in its entirety. We will comply with the sanction as soon as the timing and language are determined."
