Mapping Mapwthdefault at tiem level -Values Missing in Queue context

Question

Here is the logic
If (E1EDP19-IDTNR_EXTR is not empty and (E1EDP19-QULF)=001
map IDT_EXTR to target Buyerpart
else
    if E1EDP19-IDTNR is empty and E1EDP19-QULF=002
  if E1EDP01-MENEE IS NOT EQAUL TO AU
  map const (SEE_DESCRIPTION) to target
All context set to EDP01
Target is mandatroy field
1) data : If the 1st item level has the value IDTNR_EXTR and 2nd item level is not .
In the else condition also QUALF is not matching to 002 so not getting the value for else condition in second item level  .
So getting the error ItemDetail[2]/ns0:BuyerPartNumber. Values missing in queue context
How can we add mapwithdefault to not to fail for mandatory field
2 data I added mapwithdefault befoe else it worked for this data but failed for other test with 3 line items IDTNR_EXTR  values. 2nd line item was getting in target which is not
Thanks for your help

Answer 1

Here is udf i tried but not working as expected
String output = new String();
for (int i=0; i< qualf.length;i++)
  if(qualf[i].equals("001")&&(idntex[i]!=("")))
      output =  idntex[i];
    else
     if((qualf[i].equals("002"))&&(idtnr[i]==(""))&&(manee[i]!=("AU")))
             output =  ("Notes") ;
     result.addValue(output);
if item has only one value of idtnext and 2nd line item also it is displaying same value it should be blank
Thanks for your help