Hi Rajneesh
I appreciate your point...COPA planning and Standard cost flow (CCS) is another issue. COPA planning for reporting purpose where you will trigger data from various value field but data must be updated in that field is a pre-requisite.
You just see the process Trinath has shown and will understand that how by using P/V 3 standard cost CCS is updated in COPA field without SD cycle..so when you do your copa planning this field you can use for standard CCS value...so these are complements to each other.
But when you want to capture actual data means object level (SO/Billing) you can use P/V 1 that why I told earlier that 1 & 3 combination will serve both the purpose but have to diff value fields to capture the data.
Though I have not worked in COPA since last 2 years..so may be skipping few points..if other can put more light on my concept...
kamal