EST java.lang.NullPointerException
at wm.b2b.edi.EDIConverter.getSegment(EDIConverter.java:614)
at wm.b2b.edi.EDIConverter.createLoop(EDIConverter.java:456)
at wm.b2b.edi.EDIConverter.toEDIValues(EDIConverter.java:364)
at wm.b2b.edi.convertToValues(edi.java:657)
Check your EDI string for mandatory segments in EDI documents, seems like some thing is missing there and hence while you are trying to create a document its giving u null pointer exception.