The BBC committed a "major breach" of broadcasting rules by failing to disclose that the voice of a programme about the Gaza conflict was the son of a Hamas official, as determined by British broadcasting authority Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has found that the film was "significantly deceptive".
The head of the BBC had earlier expressed regret, saying there had been "a serious error in relation to accuracy".
The regulator has ordered the BBC to air a evening statement about its conclusions.
"As this represents a serious breach of our rules, we are directing the broadcaster to air a statement of our findings against it on BBC Two at 9pm, with a timing to be finalised," the statement read.
'Risk to Damage Credibility'
The watchdog's announcement declared: "Our investigation found that the programme's omission to reveal that the narrator's parent held a post in the Hamas-administered government was substantially inaccurate.
"This implied that the viewers did not have critical information which may have been very significant to their assessment of the presenter and the content he shared.
"Trust is at the heart of the relationship between a media organization and its public, especially for a national broadcasting corporation such as the public broadcaster.
"This failing had the risk to damage the very considerable levels of credibility that viewers would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was withdrawn from iPlayer in the month of February after the presenter's family links were revealed, and in the month of July an broadcaster's internal assessment concluded it violated the organization's content policies on factual correctness.
A representative for the broadcaster stated: "The Ofcom ruling is in line with the conclusions of the internal assessment, that there was a serious error in the programme in relation to the corporation's content standards on factual correctness, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with the regulator's ruling in complete. We will comply with the sanction as soon as the timing and language are confirmed."
