You can execute the vendor evaluation and vendor selection in the dialog or as a batch run. If you assign a large number of open purchase requisitions and want to achieve an optimal vendor assignment, you will usually need to execute the source allocation as a batch run.

• During the source allocation without rescheduling, the purchase requisitions are assigned according to the defined sort and vendor ranking criteria. For purchase requisitions that cannot be assigned to a vendor, execute an additional allocation run with modified sort and vendor ranking criteria.
• With the source allocation scheduling logic I and II purchase requisitions that have not been assigned during the source allocation run can be rescheduled within a previously fixed period. This is particularly necessary if in certain capacity periods the vendor capacities are not sufficient for providing all of the requested quantities by the requested delivery date. The delivery date of the purchase requisitions will be moved within the scheduling logic time period you have defined until all of the purchase requisitions have been able to be assigned to a vendor or until the date is no longer within the scheduling logic time period.

2. Specify the sort and vendor ranking criteria for a version of your simulation run.
3. You then execute the source allocation run, compare the results, and decide which vendors should be written as fixed vendors in your open purchase requisitions.