The BBC engaged in a "serious breach" of industry standards by failing to disclose that the voice of a film about the Gaza situation was the child of a Hamas administrator, according to regulatory body Ofcom.
An inquiry by the media regulator into the documentary titled Gaza: How to Survive a Warzone has concluded that the programme was "substantially inaccurate".
The head of the BBC had already issued an apology, stating there had been "a significant failing in relation to accuracy".
The authority has ordered the broadcaster to air a evening announcement about its decisions.
"Given this constitutes a significant violation of our rules, we are instructing the BBC to air a message of our findings against it on BBC Two at 21:00, with a timing to be determined," the statement read.
'Possibility to Undermine Credibility'
The authority's announcement said: "Our investigation determined that the film's failure to disclose that the voice's father served in a role in the Hamas-run government was substantially inaccurate.
"This implied that the viewers did not have vital facts which may have been highly relevant to their assessment of the narrator and the details he presented.
"Trust is at the core of the bond between a broadcaster and its viewers, particularly for a state-funded media outlet such as the BBC.
"This failing had the potential to undermine the exceptionally strong degrees of credibility that viewers would have put in a documentary produced by the BBC about the Gaza conflict."
The film was pulled from the online platform in February after the presenter's family links emerged, and in this past July an corporation's own inquiry concluded it infringed the organization's content policies on truthfulness.
A corporation official said: "The regulator's decision is in line with the results of Peter Johnston's review, that there was a serious error in the film in relation to the corporation's content standards on truthfulness, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with the authority's determination in its entirety. We will adhere to the directive as soon as the timing and wording are determined."
