Credit Note Allocations off

[daveparrish]

When I create a credit note for a customer who has returned a item in debtortrans it post ovamount correct and ovgst amount correct then when I go ahead and allocate the amount the ovamount is correct but the ovgst amount is rounded off here is an example
the original oavamount was -288.65 and ovgst amount was -23.813625 then after allocation of the amount the alloc in debtortrans is -312.46 and should have been 312.463625.
In turn this may show a customer balance being off .01 or -.01
Any help would be greatly appreciated.
Note the version is 4.12.3
Thanks