Selecting External SuppliersOrder-based purchase planning in Enterprise Planning handles the generation and planning of purchase orders. Purchase planning chooses between alternative suppliers and distributes volumes over these suppliers on the basis of constraints and rules. You can specify these constraints and rules in the following sessions:
Purchase planning uses supply strategies with supply type Purchase. During order-based supply planning, the following steps are carried out for each required plan item:
Step 1. Determine the requirements The master planning engine or the order planning engine determines the required volume and the requirements date. Step 2. Determine the source of supply LN determines how much of a requirement is covered by purchase on the basis of either a valid sourcing strategy or the plan item's default source. See Sources of supply. Step 3. Put the suppliers in order of preference LN orders the suppliers in accordance with the priority rule that is effective on the requirement date. You define the priority rule in the Supply Strategy (cprpd7120m000) session. Step 4. Determine the delivery date and order date by
supplier LN uses various calendars to determine the finish date (delivery date) and the start date (order date). See To compute supply lead-times. Step 5. Determine the volume by supplier LN distributes the required volume over the suppliers in the order calculated in step 3. For more details, see To compute purchase order quantities. Note If a plan item has no valid supply strategy, LN uses the following values by default:
This process is carried out in multiple phases. If, after a phase, all the requirements have not been covered, LN proceeds with the next phase. In each phase, LN plans the volume based on the allocation rule.
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