Mapping issue

Hi All;

I want to do following mapping basically but I dont know which context function I should use.

it maybe the opposite of "useOneAsMany" or something else.

<order>
    <documentNo>123456</documentNo>
    <documentLine>10<documentLine>
</order>

To

<FieldList>
   <field name=&quot;documentNo&quot;>123456</field>
   <field name=&quot;documentLine&quot;>10</field>
</FieldList>