Need help on OM extension

Content

Hi,

 We are trying to copy the Header Level EFF information from the original Sales Order to the Return Order using the below extension but are facing an error. Can anyone please guide on what is wrong in the below code :

import oracle.apps.scm.doo.common.extensions.ValidationException;
import oracle.apps.scm.doo.common.extensions.Message;
import java.util.logging.Level;

Long lineId = 0;
Long headerId = 0;
def lines = header.getAttribute("Lines");

while( lines.hasNext() )
      {
        def line = lines.next();
        String categoryCode = line.getAttribute("TransactionCategoryCode");
        if ("RETURN" != categoryCode) continue;
        def docRefs = line.getAttribute("DocumentReferences");
        lineId = 0;
        while(docRefs.hasNext() & lineId == 0)
              {
                def docRef = docRefs.next();