The BBC was found to have committed a "serious breach" of industry standards by failing to disclose that the voice of a documentary about the Gaza conflict was the offspring of a Hamas official, as determined by regulatory body Ofcom.
An inquiry by Ofcom into the documentary titled Gaza: How to Survive a Warzone has concluded that the film was "materially misleading".
The BBC's director general had already issued an apology, saying there had been "a major oversight in relation to truthfulness".
The regulator has directed the BBC to air a peak-time announcement about its decisions.
"As this represents a major infringement of our code, we are ordering the corporation to air a statement of our determinations against it on the BBC's second channel at 21:00, with a date to be determined," the statement read.
'Risk to Undermine Credibility'
The watchdog's announcement said: "Our investigation determined that the programme's lack of disclosure that the presenter's parent served in a role in the Hamas-controlled authority was substantially inaccurate.
"It meant that the audience did not have vital facts which may have been extremely pertinent to their evaluation of the presenter and the details he provided.
"Trust is at the core of the connection between a television network and its audience, especially for a public service broadcaster such as the public broadcaster.
"This error had the risk to undermine the very considerable levels of confidence that the public would have placed in a documentary produced by the BBC about the Gaza conflict."
The documentary was withdrawn from the online platform in February after the boy's familial connections came to light, and in the month of July an broadcaster's internal assessment determined it violated the broadcaster's content policies on accuracy.
A corporation official stated: "The regulator's decision is in line with the conclusions of the corporation's inquiry, that there was a significant failing in the programme in relation to the broadcaster's journalistic policies on factual correctness, which corresponds to regulation 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we agree with the regulator's ruling in full. We will adhere to the sanction as soon as the timing and language are confirmed."
