Sy-Subrc
I had this information so thought of sharing with you all.
Values of SY-SUBRC on different ABAP statements
'sy-subrc' is a return code, set by the following ABAP statements.
As a rule, if SY-SUBRC = 0, the statement was executed successfully.
转载: http://wiki.sdn.sap.com/wiki/display/ABAP/Sy-Subrc