1. 1. CALL_FUNCTION_NOT_FOUND--- error in rfc
2. SYSTEM_CANCELED ------ current program was terminated by manually.
3. TSV_TNEW_BLOCKS_NO_ROLL_MEMORY
4. TSV_TNEW_PAGE_ALLOC_FAILED --- exceeding SAP memory quota for individual W.P
5. DATASET_NOT_OPEN ----- file not found at os level to wrte data.
6. DATASET_REOPEN ------ file is already opened
7. EXPORT_TOO_MUCH_DATA when we are trying to export too much data like /SAPAPO/OM_SYNC_LC_DB
8. TIME_OUT
9. PXA_NO_SHARED_MEMORY
10. SNAPSHOT_TOO_OLD --- when PSAPTEMP tablespace 100% full..
11. SYSTEM_CORE-DUMPED --- when the kernels are old—updated the kernel
12. RFC_NO_AUTHORITY
13. SYSTEM_N0_TASK_STORAGE---- apply the latest patches
14. RAISE_EXCEPTION ---- gui related error
15. MESSAGE_TYPE_X ---- incorrect date format,
16. EXSORT_NOT_ENOUGHMEMORY
17. SYSTEM_ROLL_IN_ERROR
18. SYSTEM_NO_MORE_PAGING
19. SYNTAX_ERROR
20. LOAD_PROGRAM_NOT_FOUND