The BBC committed a "serious breach" of media regulations by not revealing that the presenter of a programme about Gaza was the offspring of a Hamas administrator, according to UK media regulator Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has found that the programme was "materially misleading".
The BBC's director general had previously apologised, noting there had been "a serious error in relation to factual correctness".
The regulator has directed the corporation to broadcast a evening announcement about its conclusions.
"Since this amounts to a major infringement of our rules, we are ordering the broadcaster to air a statement of our conclusions against it on the BBC's second channel at 21:00, with a timing to be confirmed," the regulator stated.
'Potential to Erode Credibility'
The authority's statement said: "Our investigation determined that the film's omission to reveal that the presenter's parent served in a post in the Hamas-controlled government was significantly deceptive.
"This implied that the audience did not have critical information which may have been very significant to their judgment of the narrator and the information he shared.
"Confidence is at the core of the relationship between a broadcaster and its public, particularly for a public service broadcaster such as the public broadcaster.
"This failing had the risk to undermine the very considerable amounts of credibility that the public would have invested in a factual film from the broadcaster about the conflict in Gaza."
The documentary was pulled from the online platform in last February after the boy's family links came to light, and in July an corporation's own inquiry determined it infringed the corporation's content policies on truthfulness.
A representative for the broadcaster stated: "The authority's determination is in agreement with the conclusions of Peter Johnston's review, that there was a serious error in the film in relation to the corporation's content standards on accuracy, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we accept Ofcom's decision in complete. We will follow the directive as soon as the schedule and language are determined."
