Userexit01

Question

Hi All
Kindly give me solution for my requairment.
i am explaining my requairment.
inbound idoc orders03 meesage type ordchg.
this inbound idoc is for to change the sales order.
the data comes to segments and it will update the sales order related tables here i have nothing to do.
first i will give the field names of segments
E1EDK02     BELNR     PO Number
E1EDP01     POSEX     Line Item Number
E1EDP01     MENGE     Item Quantity
E1EDP20     EDATU     Delivery Date
E1EDP19     QUALF     Identification for customer
E1EDP19     IDTNR     Material Number
these fields will automatically change  the sales order.
when changing the sales order i need to do two stpes
1)here the item Quantity is from purshase order.
  but  they donot want to chage the sales  order with this qunatity.they want to upate the quantity which is in the sales order for that purchase order number and item.
for that firsti need to get the sales order number and item from table VBFA based on the purchase order number and item.
2)Based on the salesorder number and item i need to get QUANTITY (WMENG)from table VBEP.
and to pass this wmeng to appropriate internal table which actually change the sales order.that is in function module (exit_saplvedb_001).
Please kindly response to this topic.
I have very less time to complete this task.
Kindly help me .
Please give sample coding for this .
Thanks in Advance.
Thanks&Regards.
Ramu.

Answer 1