There is something on this topic from Ibn 'Abbas.
This Hadith is Hasan Sahih. This is acted upon according to the some of the people of knowledge. A complete portion is not given to slave, but something is conferred upon him. This is the view of Ath-Thawri, Ash-Shafi'i, Ahmad, and Ishaq.
In-book : Book 21, Hadith 12
English translation : Vol. 3, Book 19, Hadith 1557