Mapping UDF Question.

Question

All,
We have the following structure from the input XML... We want to extract the PSTLZ node value into the target structure where PARVW = "WE" - Im trying to use a UDF but - im getting an error because the PSTLZ is an optional node under E1EDKA1 and not all the E1EDKA1 segments have this field. i was trying to UDF to take 2 parameters - PARVW (context at IDOC level) and PSTLZ (context at IDOC level).
Any help would be appreciated...
<IDOC>
      <E1EDKA1 SEGMENT="1">
         <PARVW>AG</PARVW>
         <PARTN>1</PARTN>
         <TELFX>XXXXX1</TELFX>
         <BNAME>Mike</BNAME>
         <PAORG>100</PAORG>
         <ORGTX>US Purchasing</ORGTX>
         <PAGRU>UG1</PAGRU>
      </E1EDKA1>
      <E1EDKA1 SEGMENT="1">
         <PARVW>RE</PARVW>
         <NAME1>SomeName</NAME1>
         <STRAS>Street 1</STRAS>
         <ORT01>City1</ORT01>
         <PSTLZ> 12345</PSTLZ>
         <REGIO>NY</REGIO>
      </E1EDKA1>
      <E1EDKA1 SEGMENT="1">
         <PARVW>LF</PARVW>
         <PARTN>2</PARTN>
         <SPRAS>E</SPRAS>
         <SPRAS_ISO>EN</SPRAS_ISO>
      </E1EDKA1>
      <E1EDKA1 SEGMENT="1">
         <PARVW>WE</PARVW>
         <LIFNR>XYZ</LIFNR>
         <NAME1>NAME1</NAME1>
         <NAME4>Name4</NAME4>
         <STRAS>some street</STRAS>
         <ORT01>BUFFALO</ORT01>
         <PSTLZ>12345</PSTLZ>
         <LAND1>US</LAND1>
         <ABLAD>YYY</ABLAD>
         <PARNR>YYY</PARNR>
         <SPRAS>E</SPRAS>
         <REGIO>US</REGIO>
      </E1EDKA1>
</IDOC>

Answer 1

rkk,
Try this
Parvw[Change Context to IDOC] --->UDF
PSTLZ[Don't Change Context] --->Map With Default[] -->Remove Context---> UDF
If there are no values from PSTLZ what u want to do? According to the above logic, it will give blank value are u ok with it?
raj.