The BBC committed a "major breach" of media regulations by omitting to mention that the voice of a programme about Gaza was the offspring of a Hamas representative, as ruled by British broadcasting authority Ofcom.
An inquiry by Ofcom into Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The BBC's director general had already issued an apology, stating there had been "a serious error in relation to accuracy".
Ofcom has directed the broadcaster to broadcast a evening statement about its decisions.
"As this represents a serious breach of our code, we are directing the BBC to transmit a announcement of our conclusions against it on BBC2 at 9pm, with a date to be finalised," the regulator stated.
'Possibility to Undermine Trust'
The regulator's report declared: "Our investigation concluded that the film's lack of disclosure that the presenter's father held a role in the Hamas-administered authority was materially misleading.
"It meant that the audience did not have critical information which may have been highly relevant to their judgment of the presenter and the content he presented.
"Trust is at the heart of the bond between a broadcaster and its audience, notably for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the possibility to damage the significantly high levels of credibility that the public would have put in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was removed from the online platform in February after the narrator's personal associations came to light, and in this past July an internal BBC review concluded it infringed the organization's journalistic standards on factual correctness.
A representative for the broadcaster stated: "The regulator's decision is in line with the conclusions of the corporation's inquiry, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on factual correctness, which reflects regulation 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we agree with the authority's determination in full. We will follow the sanction as soon as the schedule and language are finalised."
