EXIT_SAPLMEREQ_003,006,008 FOR ME51N, ME52N,ME53N

Question

I have to add a custom  filed to EBAN table. Can anybody help me with the function exit_003,006,008 regarding code.
Functional Design:
Short description
Please enter a new
numeric field “Budget” (ZZ_BUDGET) on purchase requisition item level (EBAN) on
writer Customer Data and on purchase
order item level (EKPO) on writer Customer Data
Please place it above field Project Name.
Make sure that the description “Budget” is available in all languages.
As an amount of money
should be entered, please display field EBAN_WAERS in the Purchase requisition
and EKPO_WAERS in the Purchase order behind the new Budget field and format the
new field in the same way as NETPR (###.###,##).
If somebody filled the budget field in the purchase requisition, it needs to be shown in the purchase order.

Answer 1

In Include ''ZXM02TOP'.
  TABLES:ci_ebandb.
In EXIT_SAPLMEREQ_001 ->    INCLUDE ZXM02U01
DATA :  lw_preq    TYPE mereq_item,
      CALL METHOD IM_REQ_ITEM->GET_DATA
    RECEIVING
      RE_DATA = W_PREQ.
* Here Populate the   ci_ebandb structure here with value from W_PREQ
Example ci_ebandb-zzcustom_fld = W_PREQ-zzcustom_fld
In Exit - EXIT_SAPLMEREQ_003 -> Include ZXM02U03
   DATA: w_preq TYPE mereq_item.
* Assign value from ci_ebandb to W_PREQ
Example W_PREQ-zzcustom_fld = ci_ebandb-zzcustom_fld.
   CALL METHOD im_req_item->set_data
      EXPORTING
        im_data = w_preq..
EX_CHANGED =  'X'.
Make sure your screen field should have the name with ci_ebandb.
Additionally you can write PBO and PAI logic for screen 111..
Let us know any further help.