The public service broadcaster engaged in a "significant breach" of media regulations by omitting to mention that the presenter of a documentary about the Gaza conflict was the son of a Hamas representative, as ruled by regulatory body Ofcom.
An inquiry by the broadcasting watchdog into Gaza: How to Survive a Warzone has found that the programme was "substantially inaccurate".
The chief executive of the broadcaster had previously apologised, noting there had been "a serious error in relation to accuracy".
The authority has instructed the broadcaster to broadcast a evening declaration about its decisions.
"Given this constitutes a significant violation of our rules, we are instructing the corporation to air a announcement of our conclusions against it on the BBC's second channel at 21:00, with a date to be confirmed," the statement read.
'Risk to Erode Credibility'
The authority's report declared: "Our probe concluded that the programme's lack of disclosure that the narrator's parent served in a post in the Hamas-controlled government was materially misleading.
"Consequently that the audience did not have critical information which may have been extremely pertinent to their evaluation of the voice and the content he presented.
"Trust is at the heart of the bond between a television network and its public, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This error had the risk to damage the exceptionally strong amounts of trust that viewers would have invested in a factual film from the broadcaster about the Gaza conflict."
The documentary was withdrawn from the online platform in February after the presenter's family links emerged, and in this past July an corporation's own inquiry found it violated the broadcaster's editorial guidelines on truthfulness.
A BBC spokesperson commented: "The Ofcom ruling is in line with the results of the corporation's inquiry, that there was a serious error in the documentary in relation to the corporation's content standards on factual correctness, which reflects regulation 2.2 of the regulator's media standards.
"We expressed regret for this and we comply with the regulator's ruling in complete. We will adhere to the penalty as soon as the timing and wording are finalised."
