SAP SYSTEM FIELDS INTERNAL documentation, setup help and example usage

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Internal System Fields
Internal system fields are intended solely for internal use within the ABAP runtime environment and in the kernel. They must never be overwritten from within an ABAP program and they cannot even be accessed in read-only mode.
Name Type Length Content
sy-cfwae c 5Not documented
sy-chwae c 5Not documented
sy-debug c 1Not documented
sy-dsnam c 8Name of the spool file
sy-entry c 72Not documented
sy-ffile c 8Not documented ( flatfile )
sy-fleng i -Length of a data object
sy-fodec i -Decimal places in a data object
sy-folen i -Output length of a data object
sy-ftype c 1Data type of a data object
sy-group c 1Bundling
sy-input c 1Not documented
sy-lpass c 4Not documented
sy-newpa c 1Not documented
sy-nrpag c 1Not documented
sy-oncom c 1 On Commit Flag . This system field is set to different values depending on the call status of the ABAP program. Among these, only the meaning of the value 'P' is guaranteed . If queried at all, sy-oncom can only be queried for 'P'. The value 'P' means that the program is already executing a subroutine registered using PERFORM ... ON COMMIT and a further subroutine call using PERFORM ... ON COMMIT will produce a runtime error.
sy-pauth n 2Not documented
sy-playo c 5Not documented
sy-playp c 1Not documented
sy-pnwpa c 1Not documented
sy-pri40 c 1Not documented
sy-prini n 1Not documented
sy-prlog c 1Not documented
sy-repi2 c 40Not documented
sy-rstrt c 1Not documented
sy-sfoff i -Not documented
sy-subcs c 1Call status of an executable program
sy-subty x 1Call method of an executable program
sy-tabid c 8Not documented
sy-tlopc i -Not documented
sy-tstis i -Not documented
sy-xcode c 70 Extended function code. Is filled like sy-ucomm when user actions are performed on lists. Before the length of sy-ucomm was extended from four to 70 characters,
sy-xcode was used internally to analyze longer input in the command field of the system toolbar of the list. Use sy-ucomm in application programs.
sy-xform c 30 SYSTEM-EXIT subroutine
sy-xprog c 40 SYSTEM-EXIT program