The BBC engaged in a "serious breach" of media regulations by omitting to mention that the presenter of a film about the Gaza situation was the offspring of a Hamas administrator, as determined by regulatory body Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The BBC's director general had earlier expressed regret, saying there had been "a significant failing in relation to factual correctness".
Ofcom has instructed the corporation to transmit a evening declaration about its findings.
"Given this constitutes a serious breach of our code, we are instructing the corporation to broadcast a message of our determinations against it on BBC2 at nine o'clock in the evening, with a date to be confirmed," the statement read.
'Potential to Damage Credibility'
The watchdog's announcement said: "Our probe determined that the film's lack of disclosure that the narrator's male guardian occupied a post in the Hamas-administered authority was substantially inaccurate.
"This implied that the public did not have vital facts which may have been highly relevant to their evaluation of the presenter and the content he provided.
"Trust is at the center of the bond between a television network and its audience, particularly for a state-funded media outlet such as the public broadcaster.
"This error had the potential to undermine the very considerable amounts of confidence that the public would have put in a factual film from the broadcaster about the conflict in Gaza."
The documentary was pulled from the BBC's streaming service in last February after the boy's personal associations emerged, and in the month of July an corporation's own inquiry determined it infringed the broadcaster's editorial guidelines on factual correctness.
A BBC spokesperson commented: "The authority's determination is in line with the findings of the internal assessment, that there was a significant failing in the documentary in relation to the BBC's Editorial Guidelines on factual correctness, which corresponds to Rule 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we comply with the authority's determination in its entirety. We will comply with the directive as soon as the date and language are confirmed."
