Why no OLT is created when it is over Contract Line funded limit ?

We have a Contract with a separate Contract Line for Equipment, Line #5 and the funded limit is for 870,400.00  The Contract end Date is March 28, 2015, as well as the Contract Line end Date for #5.  The Project ID End Date is September 24, 2014.  As of April 30, 2015, the total processed amount for Equipment was $80000.00 and the remaining amount was $70,400.00.  Sometime in May 2015, a voucher in the amount of $70,800.00 with an Accounting Date of 05/05/2015 (pass the Contract Line End DAte) was collected.  The expected transactions to see in Proj Resource were  BIL = $70,400.00 and OLT=$400.00 but instead a BIL for $70,800.00 was inserted to the table.

Anyone from the community that encounter same problem before?  If you do, what was the resolution?  We will appreciate if you can share it with us.