The BBC committed a "significant breach" of broadcasting rules by failing to disclose that the narrator of a programme about Gaza was the offspring of a Hamas administrator, as determined by regulatory body Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has found that the documentary was "materially misleading".
The chief executive of the broadcaster had already issued an apology, stating there had been "a major oversight in relation to truthfulness".
Ofcom has ordered the broadcaster to air a peak-time declaration about its decisions.
"Given this constitutes a major infringement of our code, we are ordering the corporation to transmit a message of our conclusions against it on BBC2 at 9pm, with a timing to be determined," the regulator stated.
'Risk to Undermine Confidence'
The authority's statement said: "Our probe found that the documentary's omission to reveal that the narrator's parent held a position in the Hamas-administered government was substantially inaccurate.
"Consequently that the viewers did not have vital facts which may have been highly relevant to their assessment of the presenter and the details he shared.
"Confidence is at the core of the relationship between a broadcaster and its viewers, especially for a public service broadcaster such as the BBC.
"This failing had the potential to erode the exceptionally strong degrees of credibility that the public would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The film was pulled from the BBC's streaming service in last February after the boy's personal associations came to light, and in July an corporation's own inquiry 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 results of the corporation's inquiry, that there was a significant failing in the programme in relation to the broadcaster's journalistic policies on factual correctness, which corresponds to regulation 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we agree with the authority's determination in complete. We will adhere to the sanction as soon as the timing and language are determined."
