ORA-14402: updating partition key column would cause a partition change

SQL> conn corporate/log

Connected.

updation script :

SQL> update STOCKVALUE set username=:username,modifiedon=to_date(:modifiedon,'dd/mm/yyyy hh24:mi:ss '),app_desc=:app_desc,app_level=:app_level,isrejected=:isrejected,qty= :qty,reservedforbranch= :reservedforbranch,batch=null,isreserved=:isreserved,amount= :amount,partyname=:partyname,gdocid=null,stock_value= :stock_value,rate= :rate,stock_qty= :stock_qty,trans_type= :trans_type,docdate=to_date(:docdate,'dd/mm/yyyy hh24:mi:ss '),docid=:docid,branch= :branch,location= :location,stocktrans_type= :stocktrans_type,postaccountflag=:postaccountflag,plusorminus=:plusorminus,expiry_date=null,packsize= :packsize,itemid= :itemid

 where STOCKVALUEid=200003000050517

status=ORA-14402: updating partition key column would cause a partition change

Solution : 

SQL> alter table STOCKVALUE enable row movement;

Table altered.

SQL> update STOCKVALUE set username=:username,modifiedon=to_date(:modifiedon,'dd/mm/yyyy hh24:mi:ss '),app_desc=:app_desc,app_level=:app_level,isrejected=:isrejected,qty= :qty,reservedforbranch= :reservedforbranch,batch=null,isreserved=:isreserved,amount= :amount,partyname=:partyname,gdocid=null,stock_value= :stock_value,rate= :rate,stock_qty= :stock_qty,trans_type= :trans_type,docdate=to_date(:docdate,'dd/mm/yyyy hh24:mi:ss '),docid=:docid,branch= :branch,location= :location,stocktrans_type= :stocktrans_type,postaccountflag=:postaccountflag,plusorminus=:plusorminus,expiry_date=null,packsize= :packsize,itemid= :itemid

 where STOCKVALUEid=200003000050517

1 row updated.