The British broadcaster committed a "serious breach" of media regulations by not revealing that the presenter of a programme about Gaza was the son of a Hamas official, as ruled by regulatory body Ofcom.
An investigation by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the programme was "substantially inaccurate".
The BBC's director general had previously apologised, noting there had been "a significant failing in relation to accuracy".
The regulator has ordered the BBC to broadcast a evening announcement about its decisions.
"Since this amounts to a major infringement of our rules, we are instructing the broadcaster to transmit a announcement of our determinations against it on BBC2 at 9pm, with a timing to be confirmed," the statement read.
'Potential to Damage Trust'
The watchdog's statement stated: "The inquiry we conducted concluded that the documentary's omission to reveal that the presenter's parent held a position in the Hamas-administered authority was materially misleading.
"Consequently that the audience did not have vital facts which may have been extremely pertinent to their evaluation of the presenter and the content he provided.
"Trust is at the heart of the bond between a television network and its audience, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the potential to damage the exceptionally strong degrees of trust that the public would have put in a factual film from the broadcaster about the conflict in Gaza."
The programme was removed from iPlayer in last February after the boy's family links were revealed, and in July an internal BBC review found it breached the organization's editorial guidelines on truthfulness.
A representative for the broadcaster commented: "The authority's determination is in accordance with the findings of Peter Johnston's review, that there was a significant failing in the documentary in relation to the broadcaster's journalistic policies on factual correctness, which corresponds to Rule 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with Ofcom's decision in its entirety. We will comply with the sanction as soon as the date and wording are determined."
