Cannot able to combine the individual production orders to a single Combined order

Hi Sapients,

  2 planned orders has got generated  from MRP which i had converted each planned order into the production orders let say 1 & 2 . Each production order  is having the same material and same base unit of measure  (Productions orders are in Created mode ) .Now want to combine the both production orders 1 & 2 to single Combined order by using the T code MILL_OC.Had maintained the selection profile and plant in MILL_OC .But " No orders are selected " is the error coming.

I had tried  the options that are  given in this blog for the same error before posting this thread, but not able to overcome this error.

Please guide me where I am going wrong.

Thanks in advance.

Regards,

Hemanth.