The BBC engaged in a "major breach" of industry standards by failing to disclose that the narrator of a programme about the Gaza situation was the offspring of a Hamas official, as determined by regulatory body Ofcom.
An inquiry by the media regulator into Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The BBC's director general had earlier expressed regret, stating there had been "a major oversight in relation to accuracy".
The regulator has directed the broadcaster to broadcast a prime-time announcement about its findings.
"Given this constitutes a serious breach of our rules, we are instructing the broadcaster to air a announcement of our determinations against it on BBC Two at 21:00, with a timing to be determined," the regulator stated.
'Risk to Undermine Trust'
The regulator's announcement declared: "Our investigation concluded that the documentary's failure to disclose that the presenter's father served in a position in the Hamas-controlled government was significantly deceptive.
"This implied that the audience did not have essential details which may have been extremely pertinent to their assessment of the voice and the details he presented.
"Trust is at the center of the bond between a broadcaster and its public, especially for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the potential to undermine the significantly high degrees of trust that viewers would have placed in a BBC factual programme about the Gaza conflict."
The documentary was removed from iPlayer in February after the presenter's family links were revealed, and in this past July an corporation's own inquiry determined it breached the organization's journalistic standards on factual correctness.
A BBC spokesperson commented: "The regulator's decision is in line with the conclusions of Peter Johnston's review, that there was a significant failing in the programme in relation to the corporation's content standards on truthfulness, which corresponds to clause 2.2 of the regulator's media standards.
"We expressed regret for this and we accept the authority's determination in complete. We will comply with the directive as soon as the timing and language are confirmed."
