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VERSION 5 IN VERSION 2 IN • sy ABAP_STRUCTURE • SYST ABAP_STRUCTURE
ABAP System Fields System fields are filled by the ABAP runtime framework and can be used in an ABAP program to query system states. BEGIN_SECTION VERSION 5 OUT With one exception (sy-repid), the system fields are variables, but they should only be used for reads. Otherwise, important information for further program execution may be lost. System fields in ABAP programs might only be overwritten in rare cases to control system behavior. The data types of the system fields -except for sy-repid- are defined in the structure SYST in the ABAP Dictionary and are instantiated as components of the built-in structure sy in ABAP programs. The structure sy exists only once in an ABAP_ISESS and is used by all programs in this ABAP_ISESS . The structure sy can also be addressed using syst. There is also a built-in data type sy, which can be used instead of the data type SYST of the ABAP Dictionary. The following table shows the system fields that can be used in ABAP programs. All other components of the structure sy are either intended only for internal use by the ABAP runtime framework or are obsolete . END_SECTION VERSION 5 OUT
