The BBC engaged in a "major breach" of industry standards by omitting to mention that the presenter of a film about the Gaza situation was the offspring of a Hamas representative, as determined by UK media regulator Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the documentary was "materially misleading".
The chief executive of the broadcaster had already issued an apology, noting there had been "a serious error in relation to accuracy".
The authority has directed the corporation to transmit a evening announcement about its decisions.
"Given this constitutes a significant violation of our regulations, we are instructing the broadcaster to air a message of our determinations against it on BBC2 at nine o'clock in the evening, with a date to be determined," it said.
'Potential to Undermine Trust'
The watchdog's report said: "The inquiry we conducted concluded that the documentary's lack of disclosure that the narrator's parent held a post in the Hamas-administered authority was materially misleading.
"It meant that the public did not have critical information which may have been very significant to their assessment of the voice and the details he provided.
"Trust is at the heart of the bond between a television network and its audience, especially for a public service broadcaster such as the BBC.
"This oversight had the potential to damage the exceptionally strong degrees of confidence that the public would have invested in a BBC factual programme about the Israel-Gaza war."
The programme was pulled from iPlayer in last February after the boy's family links were revealed, and in this past July an broadcaster's internal assessment found it breached the broadcaster's content policies on accuracy.
A representative for the broadcaster said: "The authority's determination is in agreement with the findings of the internal assessment, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on truthfulness, which corresponds to regulation 2.2 of the regulator's media standards.
"We have apologised for this and we accept the authority's determination in complete. We will follow the sanction as soon as the timing and wording are determined."
