The BBC was found to have committed a "major breach" of industry standards by omitting to mention that the narrator of a programme about the Gaza situation was the son of a Hamas official, as determined by British broadcasting authority Ofcom.
An investigation by Ofcom into the programme Gaza: How to Survive a Warzone has found that the film was "significantly deceptive".
The chief executive of the broadcaster had already issued an apology, stating there had been "a serious error in relation to truthfulness".
Ofcom has instructed the BBC to broadcast a evening declaration about its conclusions.
"As this represents a major infringement of our rules, we are directing the corporation to transmit a announcement of our determinations against it on the BBC's second channel at 21:00, with a schedule to be confirmed," the statement read.
'Potential to Damage Confidence'
The authority's announcement stated: "Our investigation found that the documentary's failure to disclose that the presenter's parent served in a role in the Hamas-controlled administration was substantially inaccurate.
"It meant that the viewers did not have vital facts which may have been extremely pertinent to their evaluation of the voice and the information he provided.
"Trust is at the core of the bond between a broadcaster and its viewers, notably for a public service broadcaster such as the public broadcaster.
"This failing had the possibility to erode the very considerable amounts of credibility that viewers would have invested in a factual film from the broadcaster about the Israel-Gaza war."
The documentary was removed from iPlayer in the month of February after the boy's familial connections emerged, and in July an broadcaster's internal assessment concluded it breached the corporation's editorial guidelines on accuracy.
A BBC spokesperson said: "The regulator's decision is in agreement with the findings of Peter Johnston's review, that there was a serious error in the programme in relation to the corporation's content standards on accuracy, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we comply with the authority's determination in complete. We will follow the sanction as soon as the timing and wording are confirmed."
