Plz , need help on IDOC mapping

Hi friends
I need help on mapping IDOC (invoic02) to a customer fields to be sent to a printhouse .
The idoc contains several Item lines , from 1  and up after for instance
The fields  E1EDP01-MENGE and E1EDP26-BETRG  could be repeated many times , the customer wants  eah line item (quantity , price and subtotal )  in separate  lines.
What is the best approach to do the mapping , and how can I loop in the idoc segments in order to get each line separetly.
Many thanks in advance.

Hi
Thanks again , plz bear with me as i am new to this kind of assignment.
This is a part of my requirement, so i suppose that I have to create a Data type as node for the customer fields corresponding to the node in IDOC and just map the source node to the target node , and it will repeat it self as many times as there is line items in the sales order.
Customer fields              Idoc fields.
                    segment E1EDP01
DETAIL_ANTAL     E1EDP01-MENGE  -  LOOP
                     segment E1EDP26
DETAIL_STK_PRIS     E1EDP26-BETRG - QUALIFIER = 001- LOOP
DETAIL_SUBTOTAL     E1EDP26-BETRG - QUALIFIER = 003 LOOP
If I change the context of the source, will it not affect the source node at all.
best regrads.

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    Kar

    Hi,
    To achieve reverse (external) context mapping, the attribute 'Input Element' in interface node of component B has to be marked. When you declare a component usage of component B in your component A, you will see the interface node under Component Usages->Interface Controllers (in your navigation tree). You can define the mapping here, between the 'Input element' node of component B and the component controller Node in comp A by right click->Define external context mapping.
    Have a look at the [documentation |http://help.sap.com/saphelp_nw04s/helpdata/en/67/cc744176cb127de10000000a155106/frameset.htm] in detail.
    You can have a look at the ALV component SALV_WD_TABLE, which uses external context mapping to render the ALV in any component using this component. This will give you a good idea.
    Regards,
    Nithya

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