CO-FI integration Query

Hi,

How does this real time CO-FI integration works? Say I have an entry in CO (posting through CATs) where I need to DR Network Activity/WBS and CR to a Cost Centre through secondary elements. Assume the profit centre also same in both line items.

Does this post a FI document if “Cross cost centre” is marked in the selection of document lines for real time integration CO->FI?

Thanks

GKP