Wrong commitment reduction when clearing down payments

Question

Hi, we are implementing PSM-FM in ERP version 6.0. We have BCS and
online payment update activated.
We are having problems regarding down payment clearings.The commitment
reduction is not working properly.
Detailed explanation:
1. We created a purchase order for a single material. FM Account
assignments to a single funds center for $500.000.(doc number 11000006).
FM integration ok!: a record for value type 51 (purchase orders), value
$500.000 is created.
2. We then create a down paymen request (trx F-47) for $100.000 with
reference to the previous purchase order.
No FM repercussion which is ok!
3. We then pay (via F110) the down payment request. We got a down
payment document for $100.000 (doc 90000008).
FM integration ok!: a record for value type 61 (down payments), value
$100.000 is created. A reduction (amount type 0200) for $100.000 also
is recorded in value type 51 (purchase orders).
4. We then make a partial goods receipt (MIGO) for $ 500.000.
No FM repercussions / postings which is ok.
5. Next, we make a partial invoice receipt (MIRO), for $110.000, total
$134.200, including VAT for $24.200 (doc 300000030).
FM integration ok!: a record for value type 54 (invoices), value
$110.000 is created. A reduction (amount type 0200) for $110.000 also
is recorded in value type 51 (purchase orders).
6. Next we partially clear the down payment against the invoice. We
need only to clear $20.000 from the original $100.000. We use trx F-54
for this. (doc 300000031)
FM integration ok!: a record for value type 61 (down payment), negative
value $20.000 is created. A record (amount type 0200) for $20.000 also
is recorded in value type 51 (purchase orders).
7. We then pay the invoice (via F110), taking into account the credit
for the previous $20.000. (doc 900000016)
FM integration issues:
7a)  For value type 54 (invoices) a reduction (amount type 0200) for
value $93.606,56 is recorded.
7b)  A "paid" (amount type 0250) for $93.606,56 also is recorded in
value type 57 (payments).
We do not desire nor understand why the system behaves like this. We
are
familiar with previous versions and the desired behavior in a 5.0
system would have been:
   The total amount of the paid invoice ($ 110.000) be recorded as
   a "paid" (amount type 0250) in value type 57 (payments).
If not, we would never see the total amount of the invoice as "paid".
Please, can you help me?
Regards,

Answer 1

Hi Diego,
I suggest you to review note 400924 since all existing critical business cases (already defined for RFFMS200) remain valid also for payment online update. I also suggest you to check the documentation using the F1 help in transaction OF29.
Make sure notes 1150182, 1166048 and 1224438 are applied in your system.
You can find information about the down payment functionality in consulting note 1279351 and also in its related notes 1001216, 532725. Also make sure your customizing is in accordance with the payment update online manual.
I hope the information above helps you.
Regards, Mateus