Does MineSched support variable processing recovery settings in a schedule?

Does MineSched support variable processing recovery as user parameters for correct calculation of final metal output from the processing plant. My MineSched paramters setting are as below:

1. Input parameters
   1. Define Geology – Metal quality as Aggregate
   2. Define Geology – User Parameters – Initial processing recovery REC is 0.86
   3. Define Geology – User Calculation – Metal_Output = Metal * REC
   4. Set Schedule – Location – Stockpile with parameters with same initial REC = 0.86
   5. Schedule parameters tab with the changed REC at a specific date on start date of year 2038.
2. Results
   1. REC check = Metal_output / Metal added to Mill
3. Review
   1. The results make me confused about how to set up correct variable processing recovery parameters to generate correct metal_output results in MineSched.
   2. My double-check of the results convince me that the REC settings in Stockpile will not change even we give a changed REC in schedule parameters tab with date /event.
4. Seek Help from Geovia MineSched Team.
   1. please help to check if I made mistakes to sestup the variable REC parameters or there is a better way to achieve this objective.