The British broadcaster was found to have committed a "serious breach" of media regulations by omitting to mention that the presenter of a programme about Gaza was the son of a Hamas official, as determined by regulatory body Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has concluded that the documentary was "materially misleading".
The BBC's director general had already issued an apology, stating there had been "a significant failing in relation to truthfulness".
Ofcom has directed the broadcaster to air a peak-time announcement about its conclusions.
"As this represents a major infringement of our rules, we are instructing the BBC to broadcast a statement of our determinations against it on the BBC's second channel at 21:00, with a timing to be determined," the statement read.
'Possibility to Undermine Credibility'
The authority's report stated: "Our investigation concluded that the programme's failure to disclose that the narrator's father occupied a position in the Hamas-run authority was materially misleading.
"This implied that the viewers did not have essential details which may have been highly relevant to their evaluation of the voice and the details he presented.
"Credibility is at the core of the connection between a media organization and its public, notably for a public service broadcaster such as the BBC.
"This oversight had the risk to erode the exceptionally strong levels of credibility that the public would have placed in a documentary produced by the BBC about the conflict in Gaza."
The film was removed from the online platform in February after the presenter's family links emerged, and in July an broadcaster's internal assessment found it infringed the corporation's editorial guidelines on accuracy.
A representative for the broadcaster said: "The regulator's decision is in agreement with the findings of Peter Johnston's review, that there was a major oversight in the documentary in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept Ofcom's decision in complete. We will comply with the directive as soon as the timing and language are confirmed."
