LISBON, PORTUGAL (AFP) - Portugal's longest trial, over sexual abuse at Lisbon's Casa Pia children's home, was further extended Monday after the court agreed to a prosecution request to change data in testimony.

Court president Ana Peres agreed to change times and places of where alleged crimes took place, involving four of seven people accused of sexual abuse of 32 boys at the institution. The will enter its sixth year on Wednesday.

Defence lawyers voiced frustration at the move, since the trial has already been adjourned several time.

"It's unacceptable to change the dates and places of crimes once testimony has finished," one of the defendants' lawyers, Paulo Sa e Cunha, told the court.

"The trial will certainly be prolonged by several months which is painful for everyone," said another defence lawyer, Ricardo Sa Fernandes.

The Casa Pia scandal broke in November 2002 when one of the interns told the press he had been raped by former Casa Pia driver and gardener, Carlos Silvino.

Centring on Portugal's most famous orphanage and involving high-profile suspects ranging from a former ambassador to television personality Carlos Cruz, it is now the longest trial in Portuguese legal history. Silvino, known as "Bibi," is the only one of the seven to have admitted his guilt.

He is accused of nearly 100 cases of sexual abuse against children, two counts of aggravated rape, as well as procuring minors for wealthy clients.

After being detained for three years, the maximum allowed under Portuguese law, he was released in November 2005 and has since been free along with the other accused.