The public service broadcaster committed a "serious breach" of media regulations by failing to disclose that the presenter of a documentary about the Gaza situation was the offspring of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The head of the BBC had earlier expressed regret, noting there had been "a major oversight in relation to truthfulness".
The authority has directed the corporation to air a evening statement about its findings.
"Since this amounts to a serious breach of our regulations, we are instructing the BBC to broadcast a message of our findings against it on BBC Two at 21:00, with a timing to be confirmed," the statement read.
'Risk to Erode Trust'
The regulator's report said: "Our investigation determined that the film's omission to reveal that the voice's parent held a position in the Hamas-administered authority was materially misleading.
"Consequently that the audience did not have essential details which may have been highly relevant to their evaluation of the presenter and the content he provided.
"Credibility is at the center of the bond between a television network and its audience, particularly for a public service broadcaster such as the public broadcaster.
"This error had the risk to undermine the very considerable degrees of credibility that viewers would have placed in a BBC factual programme about the Gaza conflict."
The programme was withdrawn from iPlayer in last February after the boy's personal associations were revealed, and in the month of July an broadcaster's internal assessment found it breached the broadcaster's content policies on accuracy.
A BBC spokesperson stated: "The authority's determination is in accordance with the results of the corporation's inquiry, that there was a serious error in the programme in relation to the corporation's content standards on truthfulness, which aligns with Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we comply with Ofcom's decision in its entirety. We will comply with the sanction as soon as the date and language are finalised."
