The BBC committed a "major breach" of industry standards by omitting to mention that the presenter of a film about the Gaza situation was the offspring of a Hamas representative, as determined by British broadcasting authority Ofcom.
An inquiry by Ofcom into the documentary titled Gaza: How to Survive a Warzone has determined that the documentary was "significantly deceptive".
The chief executive of the broadcaster had already issued an apology, noting there had been "a major oversight in relation to accuracy".
The authority has ordered the broadcaster to transmit a evening declaration about its decisions.
"Given this constitutes a major infringement of our code, we are instructing the BBC to transmit a statement of our conclusions against it on BBC2 at nine o'clock in the evening, with a date to be confirmed," it said.
'Potential to Undermine Trust'
The watchdog's report said: "Our investigation determined that the documentary's failure to disclose that the voice's parent held a role in the Hamas-run authority was significantly deceptive.
"It meant that the viewers did not have critical information which may have been highly relevant to their judgment of the presenter and the details he presented.
"Trust is at the heart of the relationship between a media organization and its viewers, particularly for a national broadcasting corporation such as the BBC.
"This failing had the potential to undermine the exceptionally strong levels of credibility that the public would have put in a BBC factual programme about the Israel-Gaza war."
The documentary was pulled from iPlayer in the month of February after the narrator's familial connections were revealed, and in the month of July an broadcaster's internal assessment determined it violated the corporation's content policies on factual correctness.
A representative for the broadcaster stated: "The regulator's decision is in accordance with the results of Peter Johnston's review, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which corresponds to Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we accept the authority's determination in complete. We will comply with the sanction as soon as the schedule and wording are determined."
