Topic: SAP Tutorial
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Understanding SAP R/3 A Tutorial for Computer Scientists
SAP R/3: Past, Presence and Future , The Integrated R/3 Repository, Enterprise Modeling with R/3, Objects of the R/3 Data Dictionary, Programming with ABAP/4 and the DynPro Concept, Customizing R/3: Concepts and Techniques, Process and System Architecture.
Class A: Application table (master or transaction data). Maintained by the customer
using application transactions. Supplied empty. Example: material master.
Class C: Customer table. Maintained only by the customer. Supplied with SAP
model entries. Tables of this delivery class are never overwritten when upgrades
are performed. Example: company code tables.
Class G: Customer table with protected content. Like class C, but SAP can add new
entries. Existing customer entries are not overwritten. Supplied with SAP model
entries. Example: number ranges.
Class L: Table for storing temporary data which can be interpreted as intermediate
results with limited time validity. Supplied empty. Example: employee groups.
Class E: System table (control table) with separate name ranges for customer
entries. The customer entries remain unchanged when upgrades are performed.
Example: special stock indicator.
Class S: System table of program nature. Maintained only by SAP. Table is filled
with system settings on delivery. Example: codes for SAP transactions.
Class W: System table for system operation and maintenance. Contents are
maintained directly by maintenance transactions. Example: function module table.
Source: www.sts.tu-harburg.de
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