The British broadcaster committed a "major breach" of industry standards by omitting to mention that the voice of a film about Gaza was the offspring of a Hamas official, as determined by UK media regulator Ofcom.
An investigation by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has found that the film was "significantly deceptive".
The BBC's director general had already issued an apology, noting there had been "a significant failing in relation to truthfulness".
The regulator has ordered the corporation to air a prime-time declaration about its decisions.
"Since this amounts to a serious breach of our code, we are instructing the corporation to air a message of our findings against it on BBC Two at nine o'clock in the evening, with a schedule to be determined," it said.
'Possibility to Damage Credibility'
The authority's announcement declared: "Our probe determined that the film's failure to disclose that the narrator's parent occupied a role in the Hamas-run administration was significantly deceptive.
"It meant that the viewers did not have critical information which may have been extremely pertinent to their assessment of the presenter and the details he presented.
"Trust is at the core of the relationship between a television network and its public, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This error had the risk to erode the significantly high levels of credibility that audiences would have put in a BBC factual programme about the Gaza conflict."
The documentary was withdrawn from the online platform in last February after the narrator's personal associations were revealed, and in July an broadcaster's internal assessment found it infringed the organization's journalistic standards on factual correctness.
A BBC spokesperson commented: "The regulator's decision is in agreement with the conclusions of Peter Johnston's review, that there was a serious error in the film in relation to the corporation's content standards on truthfulness, which aligns with regulation 2.2 of the regulator's media standards.
"We have apologised for this and we accept the authority's determination in full. We will comply with the directive as soon as the date and wording are determined."
