Ahmad ibn Muhammad from Ali ibn Mahziyar, who said:
Dawud ibn Yazid asked Abu Al-Hasan عليه السلام, about papers and parchment that have writing on them, is it permissible to prostrate upon them or not? So Imam عليه السلام wrote: "It is permissible."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 333