The BBC was found to have committed a "serious breach" of media regulations by failing to disclose that the voice of a film about the Gaza conflict was the son of a Hamas official, according to regulatory body Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the documentary was "substantially inaccurate".
The head of the BBC had earlier expressed regret, stating there had been "a significant failing in relation to accuracy".
The regulator has directed the BBC to broadcast a peak-time statement about its conclusions.
"As this represents a major infringement of our rules, we are instructing the corporation to broadcast a statement of our determinations against it on BBC Two at 21:00, with a timing to be determined," it said.
'Risk to Damage Trust'
The watchdog's report stated: "The inquiry we conducted found that the programme's lack of disclosure that the narrator's father occupied a post in the Hamas-administered administration was materially misleading.
"This implied that the audience did not have essential details which may have been highly relevant to their judgment of the presenter and the information he shared.
"Confidence is at the core of the relationship between a broadcaster and its viewers, especially for a state-funded media outlet such as the BBC.
"This oversight had the potential to undermine the exceptionally strong levels of trust that the public would have put in a factual film from the broadcaster about the conflict in Gaza."
The programme was pulled from iPlayer in last February after the presenter's familial connections came to light, and in the month of July an internal BBC review concluded it infringed the corporation's journalistic standards on truthfulness.
A corporation official stated: "The regulator's decision is in agreement with the conclusions of the corporation's inquiry, that there was a significant failing in the film in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with regulation 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we agree with Ofcom's decision in complete. We will follow the sanction as soon as the schedule and wording are confirmed."
