The British broadcaster engaged in a "major breach" of broadcasting rules by not revealing that the presenter of a programme about the Gaza situation was the son of a Hamas representative, as ruled by regulatory body 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 already issued an apology, stating there had been "a serious error in relation to accuracy".
The authority has directed the broadcaster to broadcast a peak-time announcement about its conclusions.
"Given this constitutes a significant violation of our rules, we are directing the corporation to transmit a announcement of our findings against it on BBC Two at 9pm, with a timing to be finalised," the regulator stated.
'Risk to Undermine Confidence'
The watchdog's announcement stated: "Our investigation found that the film's lack of disclosure that the presenter's father served in a position in the Hamas-run government was significantly deceptive.
"This implied that the public did not have critical information which may have been very significant to their assessment of the voice and the information he provided.
"Confidence is at the heart of the bond between a television network and its public, particularly for a public service broadcaster such as the BBC.
"This error had the risk to erode the very considerable levels of trust that audiences would have put in a factual film from the broadcaster about the conflict in Gaza."
The programme was pulled from the online platform in the month of February after the boy's familial connections were revealed, and in the month of July an internal BBC review determined it infringed the corporation's editorial guidelines on accuracy.
A BBC spokesperson stated: "The authority's determination 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 factual correctness, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with Ofcom's decision in its entirety. We will follow the directive as soon as the timing and wording are determined."
