The British broadcaster committed a "serious breach" of broadcasting rules by omitting to mention that the voice of a programme about the Gaza conflict was the son of a Hamas official, according to regulatory body Ofcom.
An probe by Ofcom into the documentary titled Gaza: How to Survive a Warzone has found that the documentary was "substantially inaccurate".
The head of the BBC had previously apologised, noting there had been "a serious error in relation to accuracy".
Ofcom has directed the corporation to transmit a evening statement about its conclusions.
"Since this amounts to a serious breach of our rules, we are directing the corporation to broadcast a statement of our findings against it on BBC Two at 21:00, with a schedule to be finalised," the statement read.
'Possibility to Undermine Trust'
The watchdog's statement said: "Our probe determined that the documentary's failure to disclose that the presenter's parent held a position in the Hamas-run administration was substantially inaccurate.
"Consequently that the audience did not have critical information which may have been very significant to their judgment of the presenter and the content he provided.
"Credibility is at the center of the relationship between a media organization and its public, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This error had the potential to undermine the significantly high amounts of credibility that audiences would have placed in a factual film from the broadcaster about the conflict in Gaza."
The documentary was withdrawn from the BBC's streaming service in the month of February after the presenter's personal associations came to light, and in July an broadcaster's internal assessment concluded it violated the broadcaster's content policies on truthfulness.
A BBC spokesperson said: "The authority's determination is in accordance with the results of the internal assessment, that there was a major oversight in the documentary in relation to the broadcaster's journalistic policies on factual correctness, which corresponds to clause 2.2 of the regulator's media standards.
"We expressed regret for this and we agree with the authority's determination in full. We will comply with the sanction as soon as the schedule and wording are finalised."
