The BBC engaged in a "serious breach" of broadcasting rules by omitting to mention that the narrator of a programme about the Gaza situation was the offspring of a Hamas administrator, as determined by UK media regulator Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has determined that the programme was "substantially inaccurate".
The head of the BBC had previously apologised, stating there had been "a serious error in relation to accuracy".
The authority has ordered the corporation to transmit a peak-time statement about its decisions.
"As this represents a serious breach of our regulations, we are directing the broadcaster to air a statement of our determinations against it on BBC Two at nine o'clock in the evening, with a timing to be finalised," it said.
'Risk to Erode Credibility'
The watchdog's announcement declared: "The inquiry we conducted found that the documentary's failure to disclose that the presenter's male guardian occupied a position in the Hamas-controlled government was materially misleading.
"This implied that the viewers did not have critical information which may have been very significant to their evaluation of the presenter and the details he provided.
"Confidence is at the heart of the bond between a television network and its viewers, particularly for a public service broadcaster such as the BBC.
"This error had the possibility to undermine the significantly high amounts of credibility that viewers would have placed in a BBC factual programme about the Israel-Gaza war."
The documentary was removed from the BBC's streaming service in last February after the presenter's familial connections came to light, and in this past July an broadcaster's internal assessment determined it breached the corporation's content policies on accuracy.
A representative for the broadcaster stated: "The regulator's decision is in accordance with the findings of the corporation's inquiry, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to regulation 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we comply with Ofcom's decision in full. We will follow the penalty as soon as the date and wording are determined."
