Bug in Auto Allocation

As reported by Aziz Kayoueche at
https://groups.google.com/d/msg/idempiere/2Mws0F8vq6k/jSWxvvorCAAJ

Hi every one
Is there any way to create allocation automatically, cause the actual process in idempiere Auto Allocation dosen't work correctly, the process changes the open balance at business partner to wrong value.
the case can be reproduced in test link https://test.idempiere.org/webui/.
if you want to reproduce the case :
1-Create invoice customer for business partner with X amount.
2-Create two or three payments receipt for the same business partner where the sum is the X amount.
Until now the total open balance at business partner is ZERO.
3-Go to process Auto Allocation and in the business partner parameter enter this business partner and check Allocate Oldest First to yes . in the end of execution of the process, go to open balance in the business partner window, you will find the value of this last wrong.

Thanks in advance