The BBC was found to have committed a "major breach" of industry standards by omitting to mention that the presenter of a programme about the Gaza conflict was the child of a Hamas representative, as ruled by UK media regulator Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The chief executive of the broadcaster had already issued an apology, noting there had been "a serious error in relation to factual correctness".
The authority has instructed the BBC to air a evening announcement about its decisions.
"Given this constitutes a significant violation of our rules, we are ordering the corporation to transmit a message of our findings against it on the BBC's second channel at 9pm, with a timing to be confirmed," the statement read.
'Risk to Damage Confidence'
The authority's announcement declared: "The inquiry we conducted determined that the documentary's failure to disclose that the presenter's father occupied a position in the Hamas-controlled administration was substantially inaccurate.
"It meant that the audience did not have critical information which may have been very significant to their assessment of the narrator and the information he provided.
"Credibility is at the heart of the connection between a television network and its viewers, notably for a public service broadcaster such as the BBC.
"This oversight had the potential to damage the very considerable levels of trust that viewers would have put in a factual film from the broadcaster about the conflict in Gaza."
The documentary was pulled from iPlayer in February after the presenter's personal associations emerged, and in the month of July an corporation's own inquiry found it breached the organization's content policies on factual correctness.
A corporation official stated: "The authority's determination is in line with the conclusions of Peter Johnston's review, that there was a significant failing in the programme in relation to the corporation's content standards on factual correctness, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we agree with the authority's determination in its entirety. We will follow the directive as soon as the date and wording are finalised."
