Hi. K.Arun Prabhu
The problem is when you update the Work Center, the order operation (table AFVC-LAR01 02 03 04 05 06) Is not updated with the new activity. This is the standard behavior and guess this is correct because the order read master data at the time of creation.
I dont think that update this table, nor enhance CO11N in order to fill this field is a solution, i mean its to risk and i dont think that work.
DeeJoy is correct about KB21 in order to post the activity directly
Arturo.