BADI--Purchase Requisition Header Long Text using Badi - ME_PROCESS_REQ_CUST.

* Create Implementation for BADI using Transaction code SE19

• Click on Method - PROCESS_HEADER
• Check the Process mode using the LOCAL class parameter TRTYP
• Populate the Text only if TRTYP is eqal to H (Creation)
• Use the interface method IF_LONGTEXTS_MM~SET_TEXT of importing parameter IM_HEADER to create long text.

• Use Text Object EBANH, Text ID B01 as parameters for above step.

Purchase Requisition Screen

Sample Code

METHOD if_ex_me_process_req_cust~process_header.
* SET purchase requisition text
* text object : ebanh (customer order header texts)
* text id : b01 (header note)
DATA : lt_textlines TYPE mmpur_t_textlines,
ls_textlines TYPE mmpur_textlines.
DATA : lv_obj TYPE REF TO object,
lv_attr TYPE string,
lv_trtyp TYPE trtyp.
FIELD-SYMBOLS: <fs_lcl> TYPE ANY.
** Get transaction State 'H' - New **
lv_obj ?= im_header.
MOVE 'MY_STATE->TRTYP' TO lv_attr.
ASSIGN lv_obj->(lv_attr) TO <fs_lcl>.
lv_trtyp = <fs_lcl>.
IF lv_trtyp EQ 'H'. "New Purchase Requisition"
REFRESH : lt_textlines.
CLEAR : ls_textlines.
MOVE 'EBANH' TO ls_textlines-tdobject.
MOVE 'B01' TO ls_textlines-tdid.
MOVE '*' TO ls_textlines-tdformat.
MOVE 'Test Header Note - Line 1' TO ls_textlines-tdline.
APPEND ls_textlines TO lt_textlines.
MOVE 'EBANH' TO ls_textlines-tdobject.
MOVE 'B01' TO ls_textlines-tdid.
MOVE '*' TO ls_textlines-tdformat.
MOVE 'Test Header Note - Line 2' TO ls_textlines-tdline.
APPEND ls_textlines TO lt_textlines.
* Call method to Update header text **
* im_count is be checked, otherwise this method will be
* called again after calling below method.
IF im_count LE 1.
CALL METHOD im_header->if_longtexts_mm~set_text(
EXPORTING
im_tdid = 'B01'
im_textlines = lt_textlines ).
ENDIF.
ENDIF.
ENDMETHOD.

Source link:http://wiki.sdn.sap.com/wiki/display/stage/Purchase+Req.+Header+Long+Text+using+Badi+-+ME_PROCESS_REQ_CUST