In case you know the specific document to correct, go to KE24 and find the respective document:

Each line is 1 document. In order to see the amounts it's necessary to add the necessary value fields (by column):

You can select layout "ALLVLFIELDS" which includes already all value fields and relevant information, but note that if you do it the transaction will take some time to run, as it will display lots of columns. On the other hand, if you already know which are the value fields or additional details that you are searching for, it's better not to use this layout, and manually add the necessary columns.