* <!-- begin-user-doc -->
* <!-- end-user-doc -->
* @generated
*/
public NotificationChain basicSetP_then_part(ThenPartAst newP_then_part, NotificationChain msgs) {
ThenPartAst oldP_then_part = p_then_part;
p_then_part = newP_then_part;
if (eNotificationRequired()) {
ENotificationImpl notification = new ENotificationImpl(this, Notification.SET, QvtAstPackage.ELIF_PART_AST__PTHEN_PART, oldP_then_part, newP_then_part);
if (msgs == null) msgs = notification; else msgs.add(notification);
}