The public service broadcaster engaged in a "serious breach" of media regulations by failing to disclose that the voice of a documentary about Gaza was the offspring of a Hamas administrator, as ruled by UK media regulator Ofcom.
An inquiry by Ofcom into the programme Gaza: How to Survive a Warzone has determined that the documentary was "significantly deceptive".
The BBC's director general had earlier expressed regret, stating there had been "a major oversight in relation to truthfulness".
The authority has ordered the BBC to transmit a evening statement about its decisions.
"Given this constitutes a serious breach of our rules, we are ordering the broadcaster to air a message of our conclusions against it on the BBC's second channel at nine o'clock in the evening, with a schedule to be determined," it said.
'Risk to Erode Credibility'
The authority's statement stated: "Our probe determined that the programme's failure to disclose that the narrator's parent held a role in the Hamas-controlled authority was substantially inaccurate.
"It meant that the audience did not have critical information which may have been highly relevant to their evaluation of the presenter and the details he presented.
"Confidence is at the heart of the relationship between a television network and its audience, notably for a state-funded media outlet such as the public broadcaster.
"This failing had the potential to erode the exceptionally strong levels of trust that audiences would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was removed from iPlayer in last February after the boy's familial connections came to light, and in this past July an broadcaster's internal assessment concluded it violated the broadcaster's journalistic standards on factual correctness.
A representative for the broadcaster stated: "The Ofcom ruling is in line with the conclusions of Peter Johnston's review, that there was a serious error in the programme in relation to the broadcaster's journalistic policies on factual correctness, which corresponds to regulation 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with the authority's determination in its entirety. We will follow the sanction as soon as the schedule and wording are determined."
