Condition Type Net Price

We are creating a Purchase Order where we enter the Net Amount then system will compute for the gross amount with VAT.  FOr instance:

Net Amount:   2,400.00

VAT AMount:     288.00

Gross Amt:    2,688.00

We were able to enter this and the computation was successful.  Pls see screenshot below:

However, when we check table EKPO, the gross value field and net value field are the same.  May we know why the gross value did not post as the gross amount?

Please advise.

Thanks,

Matt