How to update quantity attribute of Part Structure through api?

Hello Rakesh Kumar‌,

You can try below code snippet:

public class UpdateLineNumber implements RemoteAccess
{
  public static void main (String a[]) throws WTException, WTPropertyVetoException, RemoteException, InvocationTargetException
  {
  RemoteMethodServer rms = RemoteMethodServer.getDefault();
  rms.setUserName("wcadmin");
  rms.setPassword("ts");
  Class[] arg_type = {};
  Object[] ar = {};
  rms.invoke("updateLineNumberUS37", "ext.UpdateLineNumber", null, arg_type, ar);


  }
  public static void updateLineNumberUS37() throws WTException, WTPropertyVetoException, IOException
  {
  String partOid = "VR:wt.part.WTPart:657087";


  ReferenceFactory rf = new ReferenceFactory();
  WTReference obj = (WTReference) rf.getReference(partOid);
  WTPart part = (WTPart)obj.getObject();


  CheckoutLink col = WorkInProgressHelper.service.checkout(part, (Folder)WorkInProgressHelper.service.getCheckoutFolder(), "MG");
  WTPart prt =(WTPart)col.getWorkingCopy();


  QueryResult qr = wt.part.WTPartHelper.service.getUsesWTPartMasters(prt);
  while(qr.hasMoreElements())
  {
  WTPartUsageLink ul = (WTPartUsageLink)qr.nextElement();


  Quantity q = new Quantity();
  double quantity = 12;
  q.setAmount(quantity);
  ul.setQuantity(q);
  PersistenceServerHelper.manager.update(ul);
  PersistenceHelper.manager.save(prt);
  }
  // Check in part
  WorkInProgressHelper.service.checkin(prt,"cc") ;
  System.out.println("\n finihsed");
  }
}

I hope this helps you.

Regards,

Shirish