The BBC committed a "significant breach" of industry standards by omitting to mention that the presenter of a programme about the Gaza situation was the son of a Hamas representative, as determined by UK media regulator Ofcom.
An inquiry by the media regulator into Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The chief executive of the broadcaster had previously apologised, noting there had been "a major oversight in relation to truthfulness".
The regulator has directed the broadcaster to transmit a peak-time announcement about its findings.
"As this represents a major infringement of our code, we are ordering the BBC to broadcast a message of our determinations against it on BBC Two at 9pm, with a timing to be confirmed," it said.
'Risk to Undermine Trust'
The authority's statement stated: "The inquiry we conducted found that the film's omission to reveal that the narrator's father served in a position in the Hamas-administered authority was materially misleading.
"It meant that the public did not have vital facts which may have been highly relevant to their assessment of the narrator and the details he provided.
"Trust is at the heart of the connection between a broadcaster and its viewers, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the potential to erode the significantly high levels of credibility that audiences would have put in a BBC factual programme about the Gaza conflict."
The documentary was removed from iPlayer in the month of February after the presenter's family links were revealed, and in the month of July an internal BBC review concluded it breached the organization's content policies on truthfulness.
A representative for the broadcaster commented: "The regulator's decision is in line with the results of the corporation's inquiry, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept Ofcom's decision in its entirety. We will adhere to the directive as soon as the date and wording are confirmed."
