The BBC engaged in a "serious breach" of industry standards by omitting to mention that the presenter of a film about the Gaza situation was the son of a Hamas official, as determined by regulatory body Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The head of the BBC had already issued an apology, saying there had been "a major oversight in relation to factual correctness".
The regulator has instructed the broadcaster to air a peak-time statement about its findings.
"Since this amounts to a serious breach of our regulations, we are instructing the broadcaster to transmit a statement of our determinations against it on the BBC's second channel at 21:00, with a date to be determined," the regulator stated.
'Possibility to Undermine Credibility'
The authority's report said: "The inquiry we conducted found that the film's lack of disclosure that the presenter's father held a position in the Hamas-controlled administration was significantly deceptive.
"This implied that the viewers did not have critical information which may have been highly relevant to their assessment of the presenter and the information he presented.
"Trust is at the center of the connection between a media organization and its public, particularly for a national broadcasting corporation such as the BBC.
"This oversight had the risk to erode the significantly high levels of trust that audiences would have invested in a documentary produced by the BBC about the conflict in Gaza."
The film was withdrawn from iPlayer in last February after the presenter's familial connections were revealed, and in the month of July an broadcaster's internal assessment found it violated the organization's journalistic standards on truthfulness.
A corporation official commented: "The regulator's decision is in agreement with the findings of the corporation's inquiry, that there was a serious error in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which corresponds to regulation 2.2 of the regulator's media standards.
"We expressed regret for this and we agree with the authority's determination in complete. We will follow the sanction as soon as the timing and language are determined."
