Balancing Demand & Supply A Brief Guide to MRP logic

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1、BalancingDemand&Supply:ABriefGuidetoMRPlogicAnOracleWhitePaperFebruary,2003BalancingDemand&Supply:ABriefGuidetoMRPlogicABSTRACTThepurposeofmaterialplanningistobalancematerialsupplytodemandbysimulatingthefuture.Whenever,theuserrunsaMaterialRequirementsPlan,theplanningen

2、gineperformsarequirementsexplosion.Throughthisprocesstheenginetakesaquickbutdetailedlookattheexistingsourcesofdemandandsupply.Itlooksatthedateswhenmakeorbuyitemsarerequired,thedateswhentheseitemsaredueintoinventoryandsuggeststhedateswhenadditionalquantitiesneedtobeproc

3、uredorproducedtoensurethattherequirementsaremetintermsofquantityandtime.Howtheplanningengineperformsthistaskisbeyondthescopeofthispaper.Thepurposethispaperintendstofulfilistoanalyseandexplaintheoutcome,whichtheplanningprocessgenerateseverytimeamaterialplanisrun.Thepape

4、rinterpretshowthechangeswemaketotheplanningenvironmentaffecttheoutcomeandhelpsusunderstandwhyplanningrespondsthewayitdoestothesechanges.ThePlanningDetailReport(MRRDPR)isthechosentoolwewouldbeusingextensivelytostudyandanalysethebehaviouroftheplanningengine.Thisreportisw

5、ritteninPro*Canditsoutputreflectscomprehensively,theoutcomeofanyMaterialPlanrun.SCOPE&APPLICATIONThispaperisintendedforanaudiencefamiliarwiththeplanningprocess,andinvolvedincreatingandexecutingMPSandMRPplansindiscretemanufacturing.Thecontentofthispaperisarrangedinamann

6、ersoastotaketheaudiencethroughaguidedtourofthediscreteplanningprocess.Thejourneybeginswiththecreationofdemand(independentdemand)andwatchingthedemandpercolatedownthebillofmaterial.Wewouldthenbeintroducingsourcesofscheduledreceiptsfirstattheassemblylevelandthenatthecompo

7、nentlevelandanalysetheimpactofdoingso.Thereareinessencesevensourcesofscheduledreceipts–discretejobs,purchaserequisitions,purchaseorders,purchaseordersinreceiving,internal(purchase)requisitions,intransitshipmentsandintransitreceipts(i.e.intransitshipmentsinreceiving).To

8、avoidrepetition,weshallnotbeusingthelastthree.Withtheaidofthefirstfour,weshallbecoveringthesalientpointsthatwouldhelp