Should project down payment value settle to AUC

Dear all

i have two questions when settle the project to AUC

for example, the material cost for project A-01 in Dec is 2000 CNY

and down payment for project A-01 in Dec is 1000CNY

when i do the project settlement for Dec, the AUC value is 3000CNY

that is the total of material cost and down payment.

but i want to exclude the down payment value from AUC value when doing the settlement, how can i do?

the second question is, when i test run the settlement and check the sender,

i find the sender is 3000CNY with materil cost element for example 600900

but actually, it is not correct.

i created the cost element for down payment, but i can not see the line item.

how should i do? thanks a lot.

judy