** Restrictions Applying to the R/2 - R/3
Link**

The number assignment for purchase orders in each decentral system has to be defined in a such a way that the last 8 digits uniquely identify a purchase order in the corresponding decentral system.

Only the last 3 digits can be used for purchase order items in R/3 Systems.

It is important to note that the maximum quantities are smaller in R/2 than in R/3.