Marc,
Okay, I have a little bit better understanding of the business requirements.
So, to summarize:
Two plants - X and Y
All Sales and Forecasting demand in X; certain shortages are transferred to Y via Stock Transport order. It is unclear if all shortages, or just the shortages as determined by a planner using some company-specific logic. Please clarify.
It is further unclear if both X and Y are relevant for manufacturing and/or procurement from third party vendors, or if X is just considered to be a 'warehouse' type plant which is being used as a Distribution Center. Please clarify.
Four storage locations - A/B/C/D. It is unclear if tyey exist in both plants, just X; just Y? Or...?
C and D are reorder point planned. Do all materials exist in all 4 storage locations?
So, PIRs are VSF or LSF, and posted against plant X, yes? Please confirm.
"Somehow", the stock in C or D (which plant?) falls below reorder point. I assume this is due to materials being issued to a sales order, or materials being issued to a stock transport order. You have not yet described the exact methodology of the expected ins and outs of these storage locations. Please do so now; for both plants.
When the C/D stock level falls below ROP, a Reservation is generated to replenish this from A or B. Please confirm.
You also mention that the client wants to achieve improved forecast accuracy. "Somehow" he believes that 311 reservations can be used to measure/track forecast accuracy. This makes no sense to me. Can you please elaborate? The normal way to measure forecast accuracy is to compare the original forecast to the sales that were created during the same period. Why would any replenishment object be related to forecast accuracy?
Best regards,
DB49