UNexpected problem with ALV

Question

Hi all,
I am trying an ALV report. The problem here is, If I define an internal table like this
TYPES: BEGIN OF t_ekko ,
         ebeln LIKE ekko-ebeln, " Purchasing Document Number
         bukrs LIKE ekko-bukrs, " Company Code
         bsart LIKE ekko-bsart, " Purchasing Document Type
         ernam LIKE ekko-ernam, " Name of Person who Created
                                " the Object
         lifnr LIKE ekko-lifnr, " Account Number of the Vendor
         line_color(4) TYPE c,         " Line color
       END OF t_ekko.
*---- Table Memory Allocation.
DATA i_ekko TYPE t_ekko OCCURS 0.
*---- Work area Declaration.
DATA wa_ekko LIKE LINE OF i_ekko.
when I call the FM reuse_alv_fieldcatalog_merge the field catalog is not being populated.
But when I change the declaration like this
data : begin of i_ekko occurs 0,
         ebeln LIKE ekko-ebeln, " Purchasing Document Number
         bukrs LIKE ekko-bukrs, " Company Code
         bsart LIKE ekko-bsart, " Purchasing Document Type
         ernam LIKE ekko-ernam, " Name of Person who Created
                                " the Object
         lifnr LIKE ekko-lifnr, " Account Number of the Vendor
         line_color(4) TYPE c,         " Line color
       end of i_ekko.
this is working properly. But there are other instances where even the types declaration worked for me. I do not understand the strange behavioUr of ALV. If anyone can explain please explain me this.
Regards,
Varun.

Answer 1

Hi Varun,
You can try to fill the field catalog manually in the program instead of using FM reuse_alv_fieldcatalog_merge.
DATA: ls_fcat type lvc_s_fcat.
clear: ls_fcat.
ls_fcat-fieldname = 'CARRID'.
ls_fcat-inttype = 'C'.
ls_fcat-outputlen = '3'.
ls_fcat-coltext = 'Carrier ID'.
ls_fcat-seltext = 'Carrier ID'.
append ls_fcat to pt_fieldcat.
clear: ls_fcat.
ls_fcat-fieldname = 'CONNID'.
ls_fcat-inttype = 'C'.
ls_fcat-outputlen = '3'.
ls_fcat-coltext = 'Connection ID'.
ls_fcat-seltext = 'Connection ID'.
append ls_fcat to pt_fieldcat.
You can also use a macro for this. Hope it helps.
Regards,
Neeraj Gupta