The BBC engaged in a "serious breach" of industry standards by omitting to mention that the narrator of a film about Gaza was the son of a Hamas representative, as ruled by UK media regulator Ofcom.
An investigation by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the programme was "substantially inaccurate".
The BBC's director general had already issued an apology, stating there had been "a significant failing in relation to truthfulness".
The authority has directed the corporation to broadcast a evening statement about its conclusions.
"Given this constitutes a major infringement of our regulations, we are instructing the broadcaster to transmit a message of our findings against it on BBC2 at 21:00, with a date to be confirmed," the statement read.
'Possibility to Damage Credibility'
The watchdog's report declared: "The inquiry we conducted concluded that the programme's omission to reveal that the presenter's father served in a role in the Hamas-administered administration was substantially inaccurate.
"Consequently that the viewers did not have essential details which may have been highly relevant to their judgment of the voice and the information he provided.
"Credibility is at the center of the bond between a television network and its audience, particularly for a state-funded media outlet such as the public broadcaster.
"This oversight had the risk to damage the very considerable amounts of trust that audiences would have invested in a BBC factual programme about the conflict in Gaza."
The documentary was withdrawn from iPlayer in February after the narrator's family links emerged, and in July an broadcaster's internal assessment concluded it violated the organization's journalistic standards on accuracy.
A BBC spokesperson commented: "The regulator's decision is in accordance with the results of the internal assessment, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on factual correctness, which reflects clause 2.2 of the regulator's media standards.
"We expressed regret for this and we comply with Ofcom's decision in complete. We will comply with the sanction as soon as the schedule and language are confirmed."
