The public service broadcaster committed a "serious breach" of media regulations by not revealing that the narrator of a programme about Gaza was the son of a Hamas representative, as determined by regulatory body Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the film was "materially misleading".
The chief executive of the broadcaster had earlier expressed regret, stating there had been "a significant failing in relation to truthfulness".
The authority has instructed the broadcaster to transmit a peak-time statement about its decisions.
"Given this constitutes a serious breach of our rules, we are instructing the broadcaster to air a announcement of our conclusions against it on BBC2 at 9pm, with a date to be confirmed," it said.
'Possibility to Undermine Trust'
The watchdog's statement said: "The inquiry we conducted found that the documentary's lack of disclosure that the presenter's father occupied a role in the Hamas-run authority was materially misleading.
"It meant that the audience did not have essential details which may have been highly relevant to their evaluation of the presenter and the information he shared.
"Trust is at the heart of the connection between a broadcaster and its public, especially for a state-funded media outlet such as the public broadcaster.
"This error had the potential to undermine the very considerable levels of trust that viewers would have put in a factual film from the broadcaster about the Gaza conflict."
The film was removed from the online platform 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 breached the corporation's journalistic standards on accuracy.
A BBC spokesperson commented: "The regulator's decision is in accordance with the results of Peter Johnston's review, that there was a serious error 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 expressed regret for this and we accept Ofcom's decision in its entirety. We will adhere to the sanction as soon as the schedule and wording are finalised."
