The BBC was found to have committed a "serious breach" of media regulations by not revealing that the voice of a programme about the Gaza conflict was the child of a Hamas representative, as determined by regulatory body Ofcom.
An investigation by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the film was "substantially inaccurate".
The chief executive of the broadcaster had earlier expressed regret, saying there had been "a significant failing in relation to truthfulness".
Ofcom has directed the broadcaster to broadcast a prime-time announcement about its decisions.
"Since this amounts to a serious breach of our regulations, we are instructing the BBC to transmit a statement of our determinations against it on the BBC's second channel at 9pm, with a date to be confirmed," it said.
'Possibility to Damage Trust'
The regulator's report said: "Our probe concluded that the programme's lack of disclosure that the narrator's male guardian held a position in the Hamas-controlled administration was materially misleading.
"This implied that the viewers did not have vital facts which may have been highly relevant to their evaluation of the presenter and the information he presented.
"Confidence is at the core of the relationship between a media organization and its viewers, notably for a state-funded media outlet such as the public broadcaster.
"This oversight had the potential to undermine the significantly high degrees of credibility that the public would have placed in a documentary produced by the BBC about the Gaza conflict."
The film was withdrawn from iPlayer in February after the presenter's family links emerged, and in the month of July an internal BBC review concluded it violated the organization's editorial guidelines on factual correctness.
A representative for the broadcaster commented: "The Ofcom ruling 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 factual correctness, which corresponds to Rule 2.2 of the regulator's media standards.
"We have apologised for this and we accept Ofcom's decision in its entirety. We will follow the directive as soon as the schedule and wording are finalised."
