By Chris Hogg BBC News, Tokyo
The documents are reported to have been found by a Japanese journalist investigating Japan's wartime crimes in Asia.
The Dutch woman's testimony says she had her clothes ripped off her by Japanese military police.
That testimony, it is claimed, was submitted to the Tokyo War Crimes Tribunal as evidence of forced mass prostitution in Magelang, in what is now Central Java, in 1944.
Earlier this year Prime Minister Abe said that investigations had failed to find any documentary evidence that the Japanese authorities in wartime had issued orders to soldiers to coerce women into sex slavery.
He said though that he stood by a Japanese government apology to the women, known in Japan as "comfort women".
The journalist who found these documents says they contradict the prime minister's denial that the authorities were directly involved in coercion.
The Japanese Foreign Ministry says it is aware of his claims but has not seen the documents so cannot comment on what they might contain.
It says the Japanese government has investigated its wartime activities in Indonesia thoroughly and acknowledges and apologises for the country's wartime use of sex slaves.