/**
* moves a field (renumber)
*
* @param oldFieldNumber old field number
* @param newFieldNumber new field number
* @throws ISOException
*/
public void move(int oldFieldNumber, int newFieldNumber) throws ISOException {
ISOComponent c = getComponent(oldFieldNumber);
unset(oldFieldNumber);
if (c != null) {
c.setFieldNumber(newFieldNumber);
set(c);
} else unset(newFieldNumber);
}
