
Exchange rate was set according to posting date in base document
You have opened a sales or purchasing document and have selected BP Currency in the currency dropdown list in the header area and have selected a foreign currency for the amounts in the document. You have added this document.
You have drawn a sales or purchasing document from the base document you created in the previous step.
To avoid accounting issues, SAP Business One sets the exchange rate in the target document according to the posting date in the header area of the base document.
If you do not want to set the amounts in the target document according to the exchange rate on the posting date in the base document, modify the exchange rate in the header area of the target document as needed.