Interface Between COPA and LIS and How it work, logocally with configuration: From the point view of CAPA

Hi Experts,

I became hopeless on this topic and i have not found any single relevant true thing above internet. The situation is: We have already working

with COPA module, now client want to planning with SOP and LIS module, I am FICO consultant, i have read many document related on this

topic, but i can't understand things because of complexity of different step and different logic, even on SCN, Now the thing is that i  am working as a CO consultant and from my point of view/From the point of COPA~LIS~SOP, what should i have to work on this. Which step should be first or 2nd or else, how we treat this,

Thanks For All