BoJ Monetary Policy Statement is an official statement, which discloses the regulator's decision on interest rates and various measures of the monetary policy, as well as describes the economic conditions that influenced the decision.
The report is issued 8 times a year following the results of the Bank of Japan meetings and used to forecast future changes in the monetary policy.
The Statement may affect JPY depending on whether it contains some hints at tightening the monetary policy in the near future.