Talk:Euchologion of Serapion of Thmuis

In the book "The Search for the Origins of Christian Worship" By Paul F. Bradshaw, he discusses on Page 104:

... the Canons of Hippolytus present us with difficulties of interpretation: we do not know exactly where the document comes from, nor how far it represents what was really happening in the early fourth century. The authenticity of the only other major witness to the early Egyptian liturgical tradition, the Sacramentary of Sarapion, has also been questioned in the past. This collection of 30 pryaers attributed .... is extant in a single eleventh-century manuscript in the monastery of the Great Lavra on Mount Athos ...

Can a Theologian verify if this book is used historically to support the development of some of our Eastern Orthodox Sacramental services (ie. Such as Unction)? Vasiliki