The BBC engaged in a "major breach" of industry standards by failing to disclose that the narrator of a film about the Gaza situation was the son of a Hamas administrator, as ruled by regulatory body Ofcom.
An investigation by Ofcom into the documentary titled Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The chief executive of the broadcaster had earlier expressed regret, saying there had been "a serious error in relation to truthfulness".
The authority has ordered the broadcaster to broadcast a evening declaration about its findings.
"Since this amounts to a serious breach of our regulations, we are ordering the broadcaster to transmit a statement of our determinations against it on BBC Two at 21:00, with a schedule to be confirmed," the regulator stated.
'Risk to Erode Trust'
The authority's statement said: "Our investigation found that the documentary's failure to disclose that the voice's parent occupied a role in the Hamas-controlled authority was significantly deceptive.
"Consequently that the viewers did not have critical information which may have been extremely pertinent to their judgment of the voice and the content he presented.
"Trust is at the core of the connection between a television network and its viewers, notably for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the risk to damage the significantly high levels of confidence that the public would have invested in a factual film from the broadcaster about the conflict in Gaza."
The film was removed from iPlayer in the month of February after the boy's personal associations emerged, and in the month of July an broadcaster's internal assessment found it infringed the corporation's editorial guidelines on accuracy.
A BBC spokesperson stated: "The authority's determination is in accordance with the findings of Peter Johnston's review, that there was a serious error in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which reflects clause 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with Ofcom's decision in full. We will comply with the penalty as soon as the schedule and wording are determined."
