Hi,
First you need to create text type in SPRO
Go to Customer Relationship Management->Basic Settings->Text Management->Define Text Objects and Text Type->choose Text object and ID's->change mode->create your custom text type under CRMD_ORDERH
You find Text determination Procedure for your Document type from CRM_>Transactions->Basic Settings->Define Transaction Types->chose your document type and click details.
->Define text determination procedure->choose CRM_ORDERH->click procedure
Choose your document type text determination procedure and assign your text type here.
then you can use this procedure to update text type. using CRM_TEXT_MAINTAIN_OW
ls_text-ref_guid = iv_act_guid.
ls_text-ref_kind = 'A'.
ls_text-text_object = 'CRM_ORDERH'.
ls_text-tdid = 'ZZT1' your custom text type
ls_text-tdspras = 'E'.
ls_text-mode = 'A'.
LOOP AT lt_lines ASSIGNING <fs_line>.
ls_text_lines-tdformat = '*'.
ls_text_lines-tdline = <fs_line>-tdline.
APPEND ls_text_lines TO lt_text_lines.
CLEAR :ls_notes,ls_text_lines,lv_text.
ENDLOOP.
ls_text-lines[] = lt_text_lines[].
APPEND ls_text TO lt_text.
ls_field_names-fieldname = 'LINES'.
APPEND ls_field_names TO lt_field_names.
ls_field_names-fieldname = 'TDID'.
APPEND ls_field_names TO lt_field_names.
ls_field_names-fieldname = 'TDSPRAS'.
APPEND ls_field_names TO lt_field_names.
CALL FUNCTION 'CRM_TEXT_MAINTAIN_OW'
EXPORTING
it_text = lt_text
iv_object_guid = iv_act_guid
iv_object_kind = 'A'
CHANGING
ct_input_field_names = lt_field_names
EXCEPTIONS
object_kind_unknown = 1
read_error_object_buffer = 2
OTHERS = 3.
then call CRM_ORDER_SAVE
ENDIF.
Regards,
Deepika.