Sometimes reviewers may forget to record the changes they make. This is not a problem with Writer because you can find the changes if you compare documents.
In order to compare documents, you need to have the original document and the one that is edited. To compare them:
Open the edited document.
Select Edit > Compare Document.
The Insert dialog box appears. Select the original document and click Insert.
Writer finds and marks the changes and displays the Accept or Reject Changes dialog box. From this point, you can go through and accept or reject changes procedure as described earlier.