The public service broadcaster committed a "significant breach" of media regulations by not revealing that the presenter of a documentary about the Gaza situation was the offspring of a Hamas representative, according to British broadcasting authority Ofcom.
An inquiry by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the programme was "substantially inaccurate".
The chief executive of the broadcaster had earlier expressed regret, stating there had been "a significant failing in relation to accuracy".
The regulator has directed the broadcaster to broadcast a peak-time declaration about its decisions.
"Since this amounts to a serious breach of our rules, we are directing the corporation to transmit a announcement of our determinations against it on BBC Two at nine o'clock in the evening, with a timing to be confirmed," it said.
'Possibility to Undermine Credibility'
The regulator's report declared: "Our investigation concluded that the programme's omission to reveal that the voice's male guardian occupied a position in the Hamas-run government was materially misleading.
"It meant that the public did not have essential details which may have been extremely pertinent to their judgment of the presenter and the content he provided.
"Credibility is at the core of the connection between a television network and its viewers, especially for a state-funded media outlet such as the BBC.
"This oversight had the potential to erode the exceptionally strong levels of trust that audiences would have put in a documentary produced by the BBC about the Gaza conflict."
The documentary was removed from the BBC's streaming service in last February after the presenter's familial connections came to light, and in July an broadcaster's internal assessment determined it breached the organization's content policies on factual correctness.
A BBC spokesperson stated: "The authority's determination is in accordance with the conclusions of the internal assessment, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on truthfulness, 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 complete. We will adhere to the directive as soon as the date and wording are determined."
