Leave, exit, check, continue, return and reject... These statements sound alike, but differ considerably.

• REJECTis the least important; it stops the processing of the current database line and moves to the next one - where logical databases are used (e.g. in HR). Not often used in ABAPs...
• CHECK skips to the next in a DO, WHILE, LOOP or SELECT loop.
  So: a CHECK with a negative result will stop the processing of the current LOOPline and continues with the next one.
• CHECK in a FORM, FUNCTION or MODULE (not within a loop) skips the routine. The program jumps to the first statement after the cal for the FORM, FUNCTION or MODULE.
• CONTINUE is a simplified version of CHECK. CONTINUE always jumps to the next loop, as if there was written: CHECK 1 EQ 2. Applies to the loops: DO, WHILE, LOOP and SELECT.
• EXIT exits a DO, WHILE, LOOP or SELECTloop. The next statement processed is the first one after the loop.
• RETURN exits a processing block unconditionally (like CHECK 1 eq 2.)
• STOP, stops all data selection. The first statement to be processed after a STOP is: END-OF-SELECTION.
• LEAVE, is for screen flow purposes, thus LEAVE TO SCREEN 900 or LEAVE PROGRAM would define a program's screen flow.

And of course there are another ways of interrupting:

• calling an E-message (see MESSAGE)
• performing SET SCREEN 0 followed by LEAVE SCREEN. LEAVE TO SCREEN 0 is allowed as well.
• SUBMIT without AND RETURN
• LEAVE TO TRANSACTION ...

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