Change log for text in sales order

Dear SDN Experts,

If some values changes in sales order, we can see the changes in change log.

But we  are not able to see the changes in header or item text in change log.

Is this standard that you cant see changes related to header/item text in change log. If yes then is it possible to do it?

Also is it possible to retrieve the old text and new changes text by some FM or table??

Thanks

Sidharth Garg