Problem in appending text in sales Order

Hi Experts,

Requirement: I need to update the text in SALE Order Item level Text.

For Example: If some text is already there, say 'Manul Text' for the line item 10, then I need to append as 'Contract Number: Manual text price list type', but in my case I need the exact FM that satisfies my conditon.

Currently am using FM 'SAVE_TEXT'

DATA: BEGIN OF I_THEAD OCCURS 0.

INCLUDE STRUCTURE THEAD.

DATA: END OF I_THEAD.

I_THEAD-TDOBJECT = C_OBJECT.

I_THEAD-TDID = C_ID.

I_THEAD-TDSPRAS = SY-LANGU.

I_THEAD-tdname = v_tdname.

append I_THEAD.

CALL FUNCTION 'SAVE_TEXT'

EXPORTING

• CLIENT = SY-MANDT

HEADER = I_THEAD

• INSERT = 'X'

SAVEMODE_DIRECT = 'X'

• OWNER_SPECIFIED = ' '

LOCAL_CAT = ' '

• IMPORTING

• FUNCTION =

TABLES

LINES = i_line

EXCEPTIONS

ID = 1

LANGUAGE = 2

NAME = 3

OBJECT = 4

OTHERS = 5

.

Regards,

Vishwa