WBS/Cost element plan data transfer to FI

We have setup the configuration to transfer CO plan data to FI. So  Cost center / primary cost element plan data is coming to FAGLFLEXT table.

However we also want to plan aganist WBS in projects /Cost element using CJR2. the data is there COKP table , but it is not coming to FAGLFLEXT table.

I don't see WBS as a field there in the FAGLFLEXT table and not sure if it is required.

Any ideas?

Thanks in advance.