Mothae appeared in court on Monday after he was subpoenaed in order to explain the whereabouts of the requested record.
Mahao was allegedly killed execution style by fellow soldiers on June 25, 2016 in Ha Leketa, Maseru on his way from his home village Mokema.
After his murder, SADC set up a commission of inquiry headed by Justice Mphaphi Phumaphe of Botswana to establish the circumstances surrounding the killing.
Nine soldiers including Mahao’s successor Lt Gen Tlali Kamoli are accused of the murder.
The others include Motsamai Fako, Motshoane Machae, Tsítso Ramoholi, Litekanyo Nyakane, Haleo Makara, Lekhooa Moepi, Marasi 'Moleli and Mohlalefi Seitlheko.
They face multiple charges including attempted murder, theft, obstruction of justice, damage to property, aggravated assault and risk of injury or death.
After the trial commenced, the defence requested a transcribed record of proceedings of the SADC commission which has still not been submitted.
In his testimony, Mothae on Monday told the court that the SADC facilitation team has shown that the record will be released when the on-going National Reforms process has been complete, as releasing it now might jeopardise the process.
After his testimony, the prosecution spearheaded by Senior Counsel Shaun Abrahams of South Africa asked for a date of trial, adding that the case cannot be delayed any further.
SC Abrahams argued that the request for the record is an afterthought as it was made months after the accused had already pleaded.