A/R aging report: wrong bucket

Question

I have an invoice with Net 30 as payment terms(ZD30): bline date and invoice date are the same.($100)
a partial payment ($35)  is made after 45 days of date of invoice/bline date.  I put the invoice number as a reference when i made that partial payment. Theoretically the payment(14xxx document) should inherit the properties of the invoice including the payment terms and bline date/invoice date.
I ran an aging report.  The payment(-$35) is in 0-30 days(14xxx document), invoice(18xxxx)  [$100] is in 30-60 days.
How do i make sure the payment and invoice is in the same bucket date i.e 30-60 days for that aging report??  The net should be $65 under the 30-60 bucket date
Thanks

Answer 1

still confused.
the current process i have at work is that:
invoice created==  > 180000001 of $1000 is created.
partial payment received ==>  140000001 of $200 is created   << do i need to partial clear after that???>>
another partial payment received of $300 the following month==> 1400000002  <<do i need to another partial clear again after that?? >>
we dont clear open items until the full amount is received. so in open items of this customer, there will be three open items the 1800000001, 140000001, 1400000002..
when i run aging analysis
60-90 days  ==> 1800000001       +$1000
30-60 days  ===> 1400000001     -$200
0-30 days    =====> 140000002   -$300
it supposed to be
60-90 days  ==> 1800000001/14000001/14000002       $500
30-60 days 
0-30 days   
any more help? it is driving me crazy:)