The British broadcaster engaged in a "major breach" of industry standards by not revealing that the voice of a film about the Gaza conflict was the son of a Hamas administrator, according to UK media regulator Ofcom.
An inquiry by the media regulator into the documentary titled Gaza: How to Survive a Warzone has determined that the programme was "substantially inaccurate".
The chief executive of the broadcaster had previously apologised, saying there had been "a serious error in relation to accuracy".
The authority has ordered the corporation to broadcast a evening announcement about its decisions.
"As this represents a significant violation of our rules, we are instructing the corporation to air a message of our conclusions against it on BBC Two at 21:00, with a timing to be finalised," it said.
'Potential to Damage Credibility'
The authority's report said: "Our investigation determined that the programme's failure to disclose that the voice's father served in a role in the Hamas-administered administration was substantially inaccurate.
"This implied that the viewers did not have essential details which may have been extremely pertinent to their judgment of the narrator and the details he provided.
"Trust is at the center of the connection between a media organization and its audience, especially for a state-funded media outlet such as the public broadcaster.
"This error had the risk to damage the significantly high levels of trust that audiences would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The programme was withdrawn from the BBC's streaming service in February after the narrator's familial connections came to light, and in this past July an corporation's own inquiry concluded it violated the organization's content policies on truthfulness.
A corporation official said: "The regulator's decision is in agreement with the conclusions of Peter Johnston's review, that there was a significant failing in the programme in relation to the corporation's content standards on accuracy, which corresponds to regulation 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we accept Ofcom's decision in full. We will adhere to the penalty as soon as the timing and language are determined."
