I do not think downpayment is a revenue or cost on the project and hence shoudl not appear in CJI3
Downpayment is not a revenue - it is an advance
E.g
I have a sales order for 100 GBP
Downpayment of 10 GBP (advance - goes to another account, not revenue account)
First milestone payment - 40 GBP and I choose to clear downpayment - so customer will only pay 30 GBP, but revenue account against WBS will show 40 GBP (10 GBP is now converted from advance to revnue and 30 invoiced to customer = 40 GBP) - this is now visible in CJI3
This value flow for downpayment can also be seen in the cash managment flow report if cash management is active
regards
virendra