The public service broadcaster engaged in a "serious breach" of media regulations by failing to disclose that the voice of a film about the Gaza conflict was the child of a Hamas representative, as ruled by regulatory body Ofcom.
An investigation by Ofcom into Gaza: How to Survive a Warzone has found that the documentary was "materially misleading".
The BBC's director general had previously apologised, stating there had been "a serious error in relation to factual correctness".
Ofcom has ordered the broadcaster to broadcast a peak-time announcement about its decisions.
"As this represents a serious breach of our code, we are directing the corporation to air a announcement of our findings against it on BBC Two at 21:00, with a date to be confirmed," the statement read.
'Risk to Erode Credibility'
The authority's announcement stated: "Our probe determined that the documentary's failure to disclose that the narrator's parent held a role in the Hamas-controlled administration was materially misleading.
"This implied that the viewers did not have critical information which may have been highly relevant to their assessment of the presenter and the information he provided.
"Trust is at the center of the relationship between a television network and its viewers, especially for a state-funded media outlet such as the public broadcaster.
"This oversight had the risk to damage the very considerable levels of credibility that audiences would have put in a BBC factual programme about the conflict in Gaza."
The documentary was pulled from the online platform in the month of February after the narrator's family links emerged, and in this past July an corporation's own inquiry determined it violated the corporation's journalistic standards on accuracy.
A BBC spokesperson commented: "The authority's determination is in agreement with the findings of the internal assessment, that there was a significant failing in the film in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with clause 2.2 of the regulator's media standards.
"We expressed regret for this and we comply with Ofcom's decision in full. We will comply with the directive as soon as the timing and wording are determined."
