This field indicates whether or not a comment has been entered for this purchase receipt header.
The field is a button. If the picture on the button is a pencil point lying horizontally, no comment has been created for the purchase receipt. If the button shows a vertical pencil with four horizontal lines, there is a comment.
To see a comment, or create a new one, click the Comment button. The Comment Sheet window will appear. Here you can see the existing comments and create new ones.
You can also create a comment by clicking the Receipt button and then clicking Comments.