MRP Generating Purchase Reqs for Materials Needed in 2013

Hi, all. We're running MRP and it's generating a massive amount of purchase requisitions (18,310 to be exact).
The following is a typical part setup:
Lot size = EX
Planned delivery time = 5 days
GR processing time = 2 days
Individual/collective requirements = 1
MRP profile = BTO
We have one existing sales order with a delivery date in 2014.
With a lead time of roughly a week, why is MRP generating purchase requisitions out into 2013 for this material??
Thanks!
Sarah

Sarah,
MRP Profile doesn't mean much to us, they are all created individually during each implementation, and they are all different. However, I will guess that BTO is some type of Make-to-order profile.
You mention 18K of PRs. Are these all being created in a single run, or is it possible that they may have been accumulating for a while? To find out, run MRP, but using the parameter for Planning mode 'Delete and Recreate planning data'. It will delete all the unfirmed PRs and then regenerate new ones based on the current situation. I will assume for the moment that all these 'future' PRs are unfirmed, please let me know if they are not.
Since it appears to be a MTO environment (if not, let me know) then you should be able to see in the planning segment which requirement (sales order) is driving the purchase reqs. Depending on your MRP type, this could give you understanding of why MRP is proposing so many PRs.
One thing that will generate a large number of purch reqs is an unrealistic value in Maximum Lot size (MRP1 page of material master). For instance, for a requirement of 1000 widgets, and a max lot size of , say, 2, it would generate 500 PRs for 2 widgets each.
If my suggestions don't help you, please specify MRP Type, Lot Size, max lot size, rounding value, Safety stock, reorder point, Strategy group, From these values we can begin to understand your problem a little better.
Rgds,
DB49

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