Hi,
Which report you are referring to !
You created
Contract 5USD
PO created with 2 service lines 5USD( 2.5 USD each service line)
Service entry created for 1 service line 2,5USD
Now if you do not want to receive balance 2.5 USD service value, You can reduce PO value from 5USD to 2.5 USD or set deletion flag to the 2nd service line item.
Regards,
Biju K