We OBAY we have selected partial payment configuration.
For example: Invoice amount is 100 USD . Invoice number xyz.
If only one payment received in lockbox of 100 USd with ref xyz above invoice gets cleared and entire 100 USD flows in applied cash.
Issue is if in lockbox 10 items comes for 10 USD all with ref to xyz invoice.
only first 10 USD item goes to applied cash rest all 90 USD goes to unapplied cash.
Let me know if you any pointers on same , we have ECC 6