Minesched: How to adjust mine throughput to become a fixed rate?

A simplified case that consists of mine pit, dump fill, stockpile, and a process mill. I am trying to simulate a case where ore tonnage added to process are fixed (fixed mine throughput).

From the documentations it appears that the user mist be able to specify a material class for a resource capacity (so that the only material that accounts for that resource capacity is specified to fresh ore) and adjust the quantities of waste through adding material ratios targets.

When running the schedule, Minesched does not complete the schedule and produces this error:

“Materials sent to fill locations must specified within the resource capacity” 

And when removing the fill locations from scenario, the user cannot add Material ratio targets properly.
Does anyone has a fix to this issue?

Thank

Anas