The public service broadcaster committed a "major breach" of broadcasting rules by failing to disclose that the narrator of a film about Gaza was the son of a Hamas representative, as ruled by regulatory body Ofcom.
An probe by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has concluded that the documentary was "materially misleading".
The chief executive of the broadcaster had already issued an apology, stating there had been "a major oversight in relation to factual correctness".
The authority has directed the BBC to broadcast a evening statement about its conclusions.
"As this represents a serious breach of our rules, we are instructing the broadcaster to transmit a message of our findings against it on the BBC's second channel at 9pm, with a timing to be confirmed," it said.
'Potential to Damage Trust'
The watchdog's report declared: "Our investigation determined that the documentary's failure to disclose that the narrator's parent served in a role in the Hamas-controlled administration was substantially inaccurate.
"It meant that the viewers did not have critical information which may have been highly relevant to their assessment of the narrator and the information he provided.
"Trust is at the core of the connection between a television network and its public, especially for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the potential to erode the significantly high degrees of credibility that audiences would have placed in a documentary produced by the BBC about the Gaza conflict."
The documentary was removed from the online platform in the month of February after the boy's familial connections came to light, and in July an internal BBC review concluded it violated the organization's content policies on truthfulness.
A corporation official commented: "The regulator's decision is in agreement with the findings of the corporation's inquiry, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on truthfulness, which corresponds to clause 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we comply with Ofcom's decision in full. We will adhere to the penalty as soon as the schedule and wording are finalised."
