The duty of the kanmu had been mainly to carry out ceremonies and public affairs and to investigate the required precedents; therefore, the loss of archives and ancient documents that could be the source of precedents concstituted critical damage for Omiya family.
官務の職掌は朝廷の儀式・公事の遂行とそのために必要な先例の調査が主であり、先例の出典と言える官文庫古文書の喪失は大宮家にとっては致命的な打撃であった。