The BBC engaged in a "significant breach" of media regulations by failing to disclose that the presenter of a documentary about the Gaza conflict was the son of a Hamas official, according to British broadcasting authority Ofcom.
An probe by the media regulator into 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 serious error in relation to factual correctness".
Ofcom has ordered the corporation to broadcast a evening statement about its decisions.
"Given this constitutes a serious breach of our regulations, we are directing the corporation to air a statement of our determinations against it on the BBC's second channel at nine o'clock in the evening, with a date to be finalised," it said.
'Risk to Undermine Credibility'
The regulator's statement said: "Our investigation determined that the programme's lack of disclosure that the presenter's male guardian served in a position in the Hamas-administered authority was materially misleading.
"Consequently that the viewers did not have vital facts which may have been extremely pertinent to their evaluation of the presenter and the information he provided.
"Credibility is at the heart of the bond between a television network and its public, notably for a public service broadcaster such as the BBC.
"This failing had the risk to erode the exceptionally strong levels of confidence that viewers would have put in a documentary produced by the BBC about the Gaza conflict."
The film was withdrawn from iPlayer in last February after the boy's family links came to light, and in the month of July an corporation's own inquiry found it infringed the corporation's journalistic standards on accuracy.
A corporation official stated: "The authority's determination is in line with the results of the internal assessment, that there was a major oversight in the film in relation to the BBC's Editorial Guidelines on truthfulness, which reflects regulation 2.2 of the regulator's media standards.
"We expressed regret for this and we accept the regulator's ruling in complete. We will comply with the sanction as soon as the schedule and wording are confirmed."
