The British broadcaster engaged in a "major breach" of media regulations by omitting to mention that the presenter of a film about Gaza was the offspring of a Hamas administrator, as ruled by UK media regulator Ofcom.
An inquiry by the media regulator into Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The BBC's director general had already issued an apology, noting there had been "a significant failing in relation to truthfulness".
The regulator has instructed the broadcaster to transmit a evening declaration about its decisions.
"As this represents a serious breach of our regulations, we are ordering the corporation to broadcast a message of our findings against it on BBC2 at 9pm, with a timing to be finalised," it said.
'Possibility to Damage Credibility'
The regulator's report said: "The inquiry we conducted determined that the film's omission to reveal that the presenter's parent occupied a role in the Hamas-administered administration was significantly deceptive.
"Consequently that the viewers did not have critical information which may have been very significant to their assessment of the narrator and the details he provided.
"Confidence is at the core of the bond between a broadcaster and its public, particularly for a public service broadcaster such as the BBC.
"This oversight had the potential to erode the exceptionally strong degrees of credibility that viewers would have put in a factual film from the broadcaster about the Gaza conflict."
The programme was pulled from iPlayer in the month of February after the presenter's family links were revealed, and in this past July an corporation's own inquiry determined it breached the broadcaster's editorial guidelines on truthfulness.
A BBC spokesperson said: "The Ofcom ruling is in accordance with the results of the internal assessment, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on accuracy, which corresponds to Rule 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we comply with Ofcom's decision in complete. We will comply with the sanction as soon as the timing and wording are determined."
