The BBC committed a "major breach" of media regulations by not revealing that the voice of a documentary about the Gaza situation was the offspring of a Hamas representative, as ruled by regulatory body Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has determined that the programme was "materially misleading".
The BBC's director general had already issued an apology, noting there had been "a serious error in relation to truthfulness".
The regulator has ordered the corporation to transmit a evening announcement about its findings.
"Since this amounts to a serious breach of our code, we are instructing the BBC to broadcast a announcement of our determinations against it on BBC Two at 9pm, with a timing to be finalised," the regulator stated.
'Potential to Undermine Trust'
The authority's report said: "The inquiry we conducted determined that the documentary's lack of disclosure that the narrator's parent held a post in the Hamas-run authority was materially misleading.
"Consequently that the viewers did not have essential details which may have been very significant to their assessment of the narrator and the content he presented.
"Trust is at the core of the bond between a television network and its public, particularly for a national broadcasting corporation such as the public broadcaster.
"This error had the possibility to erode the exceptionally strong levels of credibility that viewers would have put in a factual film from the broadcaster about the Gaza conflict."
The documentary was withdrawn from iPlayer in last February after the boy's personal associations came to light, and in the month of July an broadcaster's internal assessment found it infringed the organization's editorial guidelines on factual correctness.
A BBC spokesperson stated: "The authority's determination is in line with the conclusions of the internal assessment, that there was a significant failing in the programme in relation to the broadcaster's journalistic policies on accuracy, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we comply with the regulator's ruling in complete. We will follow the directive as soon as the timing and language are confirmed."
