The BBC engaged in a "serious breach" of broadcasting rules by omitting to mention that the presenter of a film about the Gaza situation was the offspring of a Hamas representative, as determined by regulatory body Ofcom.
An investigation by Ofcom into the documentary titled Gaza: How to Survive a Warzone has found that the documentary was "substantially inaccurate".
The BBC's director general had already issued an apology, saying there had been "a serious error in relation to accuracy".
The regulator has instructed the broadcaster to transmit a evening declaration about its decisions.
"As this represents a serious breach of our regulations, we are instructing the BBC to air a statement of our findings against it on the BBC's second channel at 21:00, with a schedule to be confirmed," the statement read.
'Risk to Damage Confidence'
The watchdog's report declared: "Our probe found that the programme's failure to disclose that the voice's parent held a position in the Hamas-run authority was materially misleading.
"This implied that the viewers did not have vital facts which may have been very significant to their evaluation of the presenter and the content he shared.
"Trust is at the center of the connection between a television network and its public, notably for a state-funded media outlet such as the BBC.
"This oversight had the risk to erode the very considerable levels of trust that viewers would have placed in a BBC factual programme about the Israel-Gaza war."
The programme was removed from the BBC's streaming service in February after the narrator's personal associations emerged, and in July an internal BBC review concluded it infringed the corporation's editorial guidelines on accuracy.
A BBC spokesperson commented: "The regulator's decision is in accordance with the findings of the corporation's inquiry, that there was a significant failing in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with Ofcom's decision in full. We will adhere to the directive as soon as the timing and wording are determined."