The BBC was found to have committed a "major breach" of broadcasting rules by omitting to mention that the narrator of a documentary about Gaza was the offspring of a Hamas representative, according to British broadcasting authority Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has determined that the programme was "substantially inaccurate".
The chief executive of the broadcaster had already issued an apology, saying there had been "a serious error in relation to truthfulness".
The authority has ordered the BBC to air a evening statement about its findings.
"Since this amounts to a major infringement of our regulations, we are instructing the corporation to transmit a statement of our conclusions against it on BBC2 at 21:00, with a schedule to be determined," the regulator stated.
'Risk to Damage Trust'
The authority's announcement said: "The inquiry we conducted found that the documentary's lack of disclosure that the voice's father served in a position in the Hamas-administered administration was substantially inaccurate.
"This implied that the viewers did not have vital facts which may have been very significant to their judgment of the narrator and the details he provided.
"Trust is at the heart of the connection between a broadcaster and its public, especially for a state-funded media outlet such as the BBC.
"This failing had the possibility to undermine the significantly high levels of credibility that the public would have placed in a documentary produced by the BBC about the conflict in Gaza."
The film was withdrawn from iPlayer in the month of February after the presenter's familial connections emerged, and in July an internal BBC review found it breached the organization's content policies on factual correctness.
A corporation official stated: "The Ofcom ruling is in agreement with the findings of the internal assessment, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which corresponds to regulation 2.2 of the regulator's media standards.
"We issued an apology for this and we comply with Ofcom's decision in its entirety. We will follow the penalty as soon as the schedule and wording are finalised."
