Changing a Document Using the Change Function 
Procedure
You see the Change Document Initial Screen.
If your user master contains default parameters for the fields in the document key, you see these default values. Once you overwrite the default values, you see the last field entry that was made in each case.
You can also use the search help function to find the document.
You can restrict the search areas using data for classification, object links, or short texts.
– Enter the document type, the document part, and the document version.

If you want to choose the document from a list of all the available document parts or versions, choose Environment
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Document part or Version from the menu.
When you double-click, the system goes to the Basic data screen of the document you chose.
If the system accepts the data you entered on the initial screen, you see the Basic data screen. On the screen there are several tab pages where you can add or change data.
If the document has a Locked or Original processing status, you are unable to enter data in the majority of fields. If this is the case, you need to change the status.