The BBC committed a "major breach" of industry standards by failing to disclose that the voice of a documentary about Gaza was the offspring of a Hamas official, according to UK media regulator Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, stating there had been "a major oversight in relation to accuracy".
The authority has directed the BBC to transmit a prime-time announcement about its findings.
"Given this constitutes a serious breach of our rules, we are directing the broadcaster to transmit a message of our determinations against it on BBC Two at 21:00, with a date to be finalised," the statement read.
'Potential to Undermine Credibility'
The regulator's announcement declared: "The inquiry we conducted found that the film's failure to disclose that the presenter's father occupied a position in the Hamas-controlled authority was substantially inaccurate.
"It meant that the public did not have critical information which may have been extremely pertinent to their judgment of the presenter and the information he shared.
"Trust is at the core of the relationship between a television network and its public, especially for a public service broadcaster such as the BBC.
"This error had the possibility to damage the very considerable degrees of credibility that audiences would have placed in a BBC factual programme about the conflict in Gaza."
The documentary was pulled from iPlayer in February after the narrator's personal associations emerged, and in the month of July an internal BBC review found it infringed the organization's content policies on factual correctness.
A representative for the broadcaster stated: "The regulator's decision is in agreement with the conclusions of the corporation's inquiry, that there was a major oversight in the programme in relation to the broadcaster's journalistic policies on factual correctness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we agree with Ofcom's decision in complete. We will comply with the sanction as soon as the timing and wording are finalised."
