The British broadcaster was found to have committed a "significant breach" of industry standards by failing to disclose that the narrator of a film about the Gaza conflict was the offspring of a Hamas representative, according to regulatory body Ofcom.
An investigation by Ofcom into the programme Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The head of the BBC had already issued an apology, stating there had been "a serious error in relation to accuracy".
The regulator has directed the BBC to transmit a evening declaration about its findings.
"Given this constitutes a significant violation of our rules, we are ordering the broadcaster to air a message of our conclusions against it on BBC Two at nine o'clock in the evening, with a timing to be determined," the regulator stated.
'Risk to Erode Confidence'
The authority's announcement said: "Our investigation determined that the documentary's lack of disclosure that the voice's parent held a position in the Hamas-controlled government was materially misleading.
"Consequently that the public did not have vital facts which may have been extremely pertinent to their assessment of the presenter and the content he presented.
"Trust is at the core of the relationship between a broadcaster and its audience, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the risk to damage the exceptionally strong degrees of trust that the public would have placed in a BBC factual programme about the Israel-Gaza war."
The film was withdrawn from the BBC's streaming service in last February after the narrator's family links came to light, and in July an corporation's own inquiry determined it violated the broadcaster's content policies on factual correctness.
A BBC spokesperson commented: "The authority's determination is in agreement with the results of the corporation's inquiry, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which reflects clause 2.2 of the regulator's media standards.
"We expressed regret for this and we agree with the authority's determination in its entirety. We will adhere to the penalty as soon as the timing and wording are finalised."
