A real life example for using a temporary program

REPORT CHAP2503.
* Variables for later use
PARAMETERS TABNAME(10) DEFAULT 'CUSTOMERS'.
DATA: SOURCE_TABLE(72) OCCURS 100 WITH HEADER LINE,
PROGRAM_NAME LIKE SY-CPROG,
SYNTAX_CHECK_MESSAGE(128),
LINE_NO TYPE I.
* Building the source code


PERFORM BUILD_THE_SOURCE_CODE USING TABNAME.
* Generating the temporary program, checking syntax errors
GENERATE SUBROUTINE POOL SOURCE_TABLE
NAME PROGRAM_NAME
MESSAGE SYNTAX_CHECK_MESSAGE
LINE LINE_NO.
IF SY-SUBRC NE 0.
WRITE: / 'Syntax error, message', SYNTAX_CHECK_MESSAGE,
/ 'in line', LINE_NO.
EXIT.
ENDIF.
* Calling a form externally
PERFORM DISPLAY_TABLE IN PROGRAM (PROGRAM_NAME).
* Form to build the source code of the temporary program
FORM BUILD_THE_SOURCE_CODE USING F_NAME.
APPEND:
'report ztmpprog. ' TO SOURCE_TABLE,
'tables ' TO SOURCE_TABLE,
F_NAME TO SOURCE_TABLE,
'. ' TO SOURCE_TABLE,
'field-symbols

. ' TO SOURCE_TABLE,
'form display_table. ' TO SOURCE_TABLE,
'select * from ' TO SOURCE_TABLE,
F_NAME TO SOURCE_TABLE,
'. ' TO SOURCE_TABLE,
' new-line. ' TO SOURCE_TABLE,
' do. ' TO SOURCE_TABLE,
' assign component sy-index ' TO SOURCE_TABLE,
' of structure ' TO SOURCE_TABLE,
F_NAME TO SOURCE_TABLE,
' to

. ' TO SOURCE_TABLE,
' if sy-subrc ne 0. exit. endif.' TO SOURCE_TABLE,
' write

. ' TO SOURCE_TABLE,
' enddo. ' TO SOURCE_TABLE,
'endselect. ' TO SOURCE_TABLE,
'endform. ' TO SOURCE_TABLE.
ENDFORM.