Typically a part is categorized as either a manufactured part or a purchased part with associated planning outputs. However, the manufactured/acquired split feature in Inventory Part Planning Data allows you to define a part to be planned, based on the demand percentages to be sourced through manufacturing and purchasing. Planned receipts for the parts with such a split are calculated according to the percentages with order proposals generated for the corresponding quantities. For example, MRP planned part A could be defined as 60% manufactured using the Schedule supply type, and 40% purchased using the Requisition supply type. When MRP generates order proposals, 60% of the planned receipt quantities for any given day are converted to repetitive production schedules, and the remaining 40% of the planned receipts are converted into purchase requisitions.
It is important to be aware of lot sizing rules and rounding issues when considering the use of manufactured/acquired split percentages. When planning receipt quantities, the general rule used by MRP and master scheduling is to apply lot sizing rules before splitting the quantities into the manufacturing/purchasing percentages. For example, if MRP determines a net requirement of eight units, a lot size rule of 10 units is applied to that figure, the planned receipt quantity is rounded up to 10 units. After this lot sizing rule is applied, the 10 units are split into the 60/40 percentages — six units for manufacturing and four units for purchasing respectively. If the primary supplier for this part has a minimum order quantity of five units, there would be additional rounding applied within purchasing, resulting in excess order quantities.
The Manufacture/Acquire split feature allows the planning systems to automatically allocate a part's demand between manufacturing and purchasing. When inventory part planning is carried out, the percentage of planning requirements allocated to each are specified.
In a manufacture/acquire split, you must define the percentage values to manufacture and purchase, which totals to 100%. You must also indicate the specific supply types to use for the manufacturing and purchasing proportions. These supply types override the default supply type for the part.
The manufacturing/acquire split percentages are considered by the Material Requirements Planning (MRP), Master Scheduling, Next Level Demand, Inventory Reorder, and Costing features. Manufacture/Acquire splits are not considered within the planning logic of Maintenance Repair and Overhaul (MRO), Configure to Order (CTO) Interim Orders, the Capability Check or Dynamic Order Planning (DOP).
The acquire portion of the split includes all the demands acquired from internal and external suppliers. In an extreme planning case, there can be a manufacture/acquire split with the purchasing portion allocated in supplier splits of 50% internal and 50% external suppliers. Note that packaging rules and lot sizing rules for both internal planning and supplier minimum can together cause total requirement quantities to be inflated to exceed actual demand.
It is also possible to specify how costing will be applied to the manufacture/acquire split proportions when calculating rolled up material costs. See Costing for further information.
The manufacture/acquire split can only be defined for parts that can be manufactured, including the Manufactured, Manufactured Recipe, and Purchased part types. Purchase Raw and Expense part types, and parts with planning methods K (Blow Through), T (Master Scheduling Level 0 Phantom) and O (Master Scheduling Level 0 Part), cannot be manufacture/acquire split parts.
Manufacture/acquire splits can be defined for, but are not considered by the planning logic of MRO, the Capability Check, CTO or DOP.