Lawyers appealing the presidential decree that denied Myuran Sukumaran and Andrew Chan clemency have presented evidence to a Jakarta court.
Lawyer Leonard Arpan says the evidence handed to the state administrative court on Wednesday concerned laws on the president's prerogative rights.
They will return to court on Monday with an expert witness.
Lawyer for the state Rusdihadi Teguh told reporters outside court they would object if the witness tried to give evidence apart from that related to the dismissal of the challenge.
The administrative court last month rejected the challenge of the decree denying clemency, on jurisdictional grounds.
The ruling sent Chan and Sukumaran a step closer to the firing squad for their 2005 heroin smuggling bid but no date has been set for their executions.
Last week the court laid out a timetable for the appeal, asking that it wrap up on April 1 for a decision soon afterwards.
If they are given the chance, lawyers for Chan and Sukumaran will argue President Joko Widodo didn't properly assess their clemency case - including their well-documented rehabilitation - before issuing a blanket rejection to the Australians as drug offenders.
Indonesia's Attorney-General HM Prasetyo has committed not to execute Chan and Sukumaran before their legal avenues are exhausted.
Seven of 10 prisoners in line for execution are pursuing court action and Mr Prasetyo says he will respect all of their legal processes.
Meanwhile, Chan and Sukumaran wait in lonely conditions on Nusakambangan island where the simultaneous executions are planned.
Foreign Minister Julie Bishop says she does not expect to be updated on the situation until the legal appeals are complete.
Indonesia's Foreign Ministry meanwhile says it has passed on a request from Prime Minister Tony Abbott to speak by phone to Mr Joko.
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