It is always requrie to change documents once it is prepared.For this there may be many reasons like changing of values or modification of vendor or customer name etc.Enter the document number,the company code,and the fiscal year.The default is the document number from the last processed document in the session. The initial company code is the company code that was used in the previous function.If the document number is used in more than one fiscal year, an additional window displays the various documents that can be selected.