To perform a project material requirement planning (PMRP) calculation, you must have entered parts with on-hand quantities and structures. Also, some forms of supply and/or demand such as customer orders, shop orders, and purchase orders must be associated with these parts. Beyond these basic requirements, many other factors affect PMRP. You should be aware of them before performing a PMRP calculation. These factors are listed below.
Control parameters determine the conditions for running PMRP:
The planning of PMRP start times depends on the information entered in the project calendar. Only work days can appear in the calendar. Weekends and holidays are not counted when setting the start time for PMRP.
The selections that you make in the Manufacturing tab of the Site window determine how the system processes the part during PMRP. Selecting the Use Rel Purch Reqs in Planning check box causes PMRP to not delete purchase requisitions in status Released at the start of the PMRP run. These are viewed as supply later in the PMRP process.
You can specify the lead time and the lead time code for each inventory part on the Acquisition tab of the Inventory Part window. This information controls how the part is processed when it is in demand. The lead time code determines whether the system creates a manufacturing or purchasing proposal to fulfill the demand for the part. The default supply type on the Planning Data tab of the Inventory Part window determines the type of proposal: requisition, order, or schedule.
The information that you enter on the Planning Data tab of the Inventory Part window determines how the system processes the part during PMRP. The planning method and lot size values determine how the demand is processed. During PMRP, the system does not process parts with a planning method B (Order Point Planning), C (Replenishment Level), or N (Next Level Demand). The value in the Proposal Release field determines whether the system creates order proposals or any type of supply, such as shop requisitions, and purchase requisitions. When generating proposals, the manufactured/acquired split percentages defined on the Planning Data tab are considered when you generate proposals for both in-house and outside sources to obtain the supply details.
Before starting PMRP, you must enter the structures of the parts that will be manufactured. These structures must have a structure type of Manufactured, (standard manufacturing). Also, they must be valid at the time of manufacturing. PMRP breaks the structures down into components for the calculated start date. Note that PMRP works with structures for both standard parts and project specific parts, which does not have a variant or serial number.