The public service broadcaster committed a "serious breach" of broadcasting rules by omitting to mention that the narrator of a programme about the Gaza conflict was the offspring of a Hamas official, as determined by regulatory body Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has found that the programme was "materially misleading".
The BBC's director general had already issued an apology, noting there had been "a major oversight in relation to accuracy".
The authority has instructed the broadcaster to broadcast a evening announcement about its findings.
"Given this constitutes a major infringement of our code, we are directing the corporation to transmit a statement of our conclusions against it on BBC Two at nine o'clock in the evening, with a timing to be confirmed," it said.
'Possibility to Damage Trust'
The watchdog's report stated: "Our investigation determined that the programme's lack of disclosure that the presenter's male guardian served in a position in the Hamas-run administration was materially misleading.
"This implied that the viewers did not have vital facts which may have been very significant to their assessment of the narrator and the information he presented.
"Trust is at the center of the connection between a broadcaster and its public, notably for a state-funded media outlet such as the BBC.
"This error had the possibility to erode the very considerable levels of credibility that audiences would have invested in a factual film from the broadcaster about the conflict in Gaza."
The programme was withdrawn from the online platform in last February after the presenter's familial connections were revealed, and in the month of July an internal BBC review concluded it violated the broadcaster's editorial guidelines on accuracy.
A corporation official stated: "The Ofcom ruling is in accordance with the conclusions of the corporation's inquiry, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which reflects Rule 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with the regulator's ruling in its entirety. We will adhere to the directive as soon as the schedule and language are determined."
