The reason why SAP has put this limitation on it is, is to avoid an overflow of the program memory. Changing this number is not possible because it is a kernel constant and therefore, not variable and removing memory segments from the PXA is currently not supported by the kernel...
So you need to look for another solution.
There are 2 main reasons why you would want to generate a subroutine:
1. To create a dynamic structure
2. To create a dynamic program
Let me give you the solution for those 2 types of creating subroutines.
1. Create a dynamic structure:
Old Code
DATA: lt_code(100) TYPE c OCCURS 0 WITH HEADER LINE,
lv_type(100),
lv_repid LIKE sy-repid,
lw_fcat TYPE lvc_s_fcat.
* DYNAMISCH TYPES GENEREREN IN PROGRAMMA'S
lt_code = 'REPORT GENERATE_TYPES.'.
APPEND lt_code.
lt_code = 'TYPES: BEGIN OF T_DATA,'.
APPEND lt_code.
LOOP AT p_fcattab INTO lw_fcat.
CONCATENATE lw_fcat-fieldname
'('
lw_fcat-intlen
') TYPE c,'
INTO lt_code.
APPEND lt_code.
ENDLOOP.
lt_code = 'END OF T_DATA.'.
APPEND lt_code.
GENERATE SUBROUTINE POOL lt_code NAME lv_repid.
CONCATENATE '\PROGRAM=' lv_repid '\TYPE=T_DATA' INTO p_type.
New Code
*&--------------------------------------------------------------*
*& Form CREATE_INTERNAL_STRUCTURE
*&--------------------------------------------------------------*
* Create internal structure
*---------------------------------------------------------------*
FORM CREATE_INTERNAL_STRUCTURE TABLES p_fcattab TYPE lvc_t_fcat
CHANGING p_struc TYPE REF TO cl_abap_structdescr
p_struc_table TYPE REF TO cl_abap_tabledescr.
DATA: ls_comp TYPE abap_componentdescr,
lw_fcat TYPE lvc_s_fcat,
lt_comp TYPE cl_abap_structdescr=>component_table,
lv_integer TYPE i.
LOOP AT p_fcattab INTO lw_fcat.
ls_comp-name = lw_fcat-fieldname.
lv_integer = lw_fcat-intlen.
ls_comp-type = cl_abap_elemdescr=>get_c( lv_integer ).
APPEND ls_comp TO lt_comp.
ENDLOOP.
TRY.
p_struc =
cl_abap_structdescr=>create( p_components = lt_comp ).
CATCH cx_sy_struct_creation .
ENDTRY.
TRY.
p_struc_table = cl_abap_tabledescr=>create( p_struc ).
CATCH cx_sy_table_creation .
ENDTRY.
ENDFORM. " CREATE_INTERNAL_STRUCTURE
2. Create a dynamic program
Main Program
...
EXPORT <whatever is needed> TO MEMORY ID 'ABC'.
* Execute the code generation logic in new internal mode
SUBMIT <Sub Program> AND RETURN.
Sub Program
...
IMPORT <whatever is needed> FROM MEMORY ID 'ABC'.
* Logic to generate the internal table of ABAP code
...
GENERATE SUBROUTINE POOL <codetab> NAME gv_program.
IF SY-SUBRC EQ 0.
PERFORM <generated form> IN PROGRAM (gv_program).
ENDIF.
