Duplicate values in message mapping

Hi Guys,

I have IDoc to file scenario and source IDoc have two same fields from two different segments but target there is only one field to send to. What is the best way and how to map two source fields to one target field by removing duplicate values from source fields? Can this be done with graphical mapping or need UDF?

Source:
<E1EDP01 SEGMENT="">
    <MATNR>12345</MATNR>
     </E1EDP01>
<E1EDL44 SEGMENT="">
<MATNR>12345</MATNR>
</E1EDL44>

Target:
<Material>12345</Material>

Thanks,

Marko