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ABAP Keyword Documentation → ABAP Glossary →Call sequence
A call sequence is the set of programs whose internal sessions are loaded by a sequence of calls using SUBMIT ... AND RETURN or CALL TRANSACTION in a joint main session. You can return to the preceding programs in the call sequence from every program. The first program in a call sequence is the top level transaction. The programs of a call sequence have collective access to the ABAP Memory. A call sequence can be left completely using the statement LEAVE TO TRANSACTION.