Sub contracting and production time

Hello Experts,
My problem is related to sub contracting and how to reflect the time the subcontractor needs to produce the goods.
My system works as follows.
I create a subcontacting for material A. This material has delivery time 5 days. I supply the subcontractor vendor with material B. This material has also delivery time 5 days.
So, when I set the delivery date to ie 02.02.09 for component A, I get the requirements date for component B to 10 days less than my requirements date.
This means that I need to have B in my stock 10 days before I get A into stock. I guess that this is caluclated using A and B's delivery time and in this case, the five days i meant to reflect the number of days from me to the vendor.
This does not reflect my needs.
I also need to be able to reflect the production time at the vendor. This is the number of days between he receive B and when he can ship A. As this works now, the vendor is given no time to manifacture A out of B.
Second, the time it takes to ship B will be very different denpendent on which vendor who will receive it.
Any ideas how this is done?
rgds
GAR

Hi,
Please define the Total replenishment lead time (in workdays) according to your requirement.
There is no point in maintaining the Total replenishment lead time field (in MRP 3 view of material master) for materials procured externally.
In external procurement, the system adds the processing time from purchasing (maintained in SPRO> Materials Management> Consumption Based Planning> Plant Parameters> Carryout overall maintanance of Plant Parameters-->Maintain --> External Procurement), the planned delivery time, and the goods receipt processing time ( both in the MRP 2 view of material master data or in Vendor master data) and uses this total as the replenishment lead time for an availability check with replenishment lead time.
Hope this will help.
Regards,
Narayana.

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https://forums.sdn.sap.com/click.jspa?searchID=7109743&messageID=4056008
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We have a routing with 8 operations. The 6th operation is an external operation (PP02 control key). When the production order is released a Purchase Requisition is created. It is a subcontracting PR. But the PR does not have any component assigned to it. Also the PR line item is blank. It just shows the operation description in the Mtrl description field.
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