OM Extension to update Schedule ship date

Summary:

The requirement is to update the schedule ship date = Requested ship date -15 days. Used the groovy script given in oracle document (Doc ID 3019572.1) to update Schedule ship date. Facing Jave Exception error .

Need your Expert advice to fix this.

Content (please ensure you mask any confidential information):

Groovy script:

import oracle.apps.scm.doo.common.extensions.ValidationException;
import oracle.apps.scm.doo.common.extensions.Message;

def LineRSD = line.getAttribute("RequestShipDate");
if (LineRSD == null) return;
def LineRSD_Time = LineRSD.getTime();
def vPSD = new java.sql.Date(LineRSD_Time - getTimeInMillis(15));
def lines = header.getAttribute("Lines");
while( lines.hasNext() ) {
def line = lines.next();