https://userapps.support.sap.com/sap/support/knowledge/en/2284307
2284307 - SAP FS-BA: AEP and FX rate (Error /BA1/F4_FX085) | SAP Knowledge Base Article
You run transaction /BA1/B1_AEP - Process Accounting Events and receives the following error message: Cannot determine exchange rate Message no. /BA1/F4_FX085...