The public service broadcaster engaged in a "serious breach" of broadcasting rules by failing to disclose that the voice of a documentary about the Gaza situation was the offspring of a Hamas administrator, according to British broadcasting authority Ofcom.
An inquiry by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the programme was "substantially inaccurate".
The BBC's director general had previously apologised, saying there had been "a significant failing in relation to accuracy".
The authority has instructed the corporation to broadcast a evening statement about its conclusions.
"Since this amounts to a major infringement of our regulations, we are ordering the BBC to transmit a announcement of our conclusions against it on BBC Two at 9pm, with a timing to be determined," the statement read.
'Possibility to Erode Trust'
The regulator's report declared: "The inquiry we conducted found that the documentary's omission to reveal that the voice's father occupied a role in the Hamas-run authority was materially misleading.
"This implied that the public did not have vital facts which may have been extremely pertinent to their assessment of the voice and the content he shared.
"Confidence is at the core of the connection between a media organization and its public, particularly for a state-funded media outlet such as the public broadcaster.
"This failing had the potential to erode the significantly high levels of trust that audiences would have put in a BBC factual programme about the Israel-Gaza war."
The programme was removed from the BBC's streaming service in February after the presenter's personal associations emerged, and in July an corporation's own inquiry found it violated the corporation's journalistic standards on truthfulness.
A BBC spokesperson commented: "The regulator's decision is in accordance with the conclusions of Peter Johnston's review, that there was a serious error in the programme in relation to the corporation's content standards on factual correctness, which aligns with clause 2.2 of the regulator's media standards.
"We expressed regret for this and we accept Ofcom's decision in complete. We will adhere to the directive as soon as the schedule and language are determined."
