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<ManualTopic ID="/baanerp/cp/onlinemanual/000054" xml:lang="en">
	<Header>
		<Title xmlns:ssa="http://www.ssaglobal.com" xmlns:HTML="http://www.w3.org/TR/REC-html40">To compute phase numbers for order-based planning</Title>
		<Keyword><Level1>Phase numbers</Level1>
			<Level2>computing for order-based planning</Level2>
		</Keyword>
	</Header>
	<GeneralSection><List><ListIntro>SSA ERP bases the <Link href="/baanerp/cp/glossary/glossary#000045" role="glossary">phase number</Link> for order-based planning on the following data:</ListIntro>
			<ListItem><Link href="/baanerp/ti/glossary/glossary#BillOfMateri.ti" role="glossary">Bill of material (BOM)</Link>
			</ListItem>
			<ListItem><Link href="/baanerp/cp/glossary/glossary#000005" role="glossary">Supplying relationships</Link>
			</ListItem>
		</List>
		<Paragraph>SSA ERP computes a phase number for each plan item.</Paragraph>
		<GeneralSection><SectionTitle>Criteria for phase numbers</SectionTitle>
			<List><ListIntro>The phase numbers of the plan units must conform to the following criteria:</ListIntro>
				<ListItem>If a plan items is defined as a component of another plan item in a BOM, the phase number of the component must be greater than the phase number of the parent.</ListItem>
				<ListItem>If a supplying relationship exists between two plan items that belong to the same site, the phase number of the supplying item must be greater than the phase number of the receiving item.</ListItem>
				<ListItem>If a supplying relationship exists between two plan items, and both items are controlled by central multisite planning, the phase number of the supplying item must be greater than the phase number of the receiving item.</ListItem>
			</List>
		</GeneralSection>
		<Note><SectionTitle>Note</SectionTitle>
			<Paragraph>An item is controlled by central multisite planning if the <GUIRef href="/baanerp/cp/rpd/cprpd1100m000#cprpd100.mult" role="formfield">Central Multi Site Planning</GUIRef> check box in the <GUIRef href="/baanerp/cp/rpd/cprpd1100m000" role="session">Items - Planning (cprpd1100m000)</GUIRef> session has been selected. Moreover, there must be a central multisite scenario that includes the sites involved. If you use the <GUIRef href="/baanerp/cp/rpd/cprpd6200m000" role="session">Compute Phase Numbers (cprpd6200m000)</GUIRef> session to recompute phase numbers for central multisite planning, you need to specify the multisite scenario involved.</Paragraph>
		</Note>
		<GeneralSection><SectionTitle>Computation procedure</SectionTitle>
			<List><ListIntro>The computation of the phase numbers is an iterative process. You can choose between two methods:</ListIntro>
				<ListItem>Regenerative computation</ListItem>
				<ListItem>Net-change computation</ListItem>
			</List>
			<Paragraph>In a regenerative computation, every plan item initially gets phase number 0. SSA ERP then checks the plan items one by one and adjusts their phase numbers until the criteria for phase numbers are fully met. For information on the net-change computation see <Link href="/baanerp/cp/onlinemanual/000055" role="manual">Net-change phase number computation</Link>.</Paragraph>
			<Paragraph>You can see the result of the computation in the <GUIRef href="/baanerp/cp/rpd/cprpd1100m000#cprpd100.mrph" role="formfield">Order Phase Number</GUIRef> field in the <GUIRef href="/baanerp/cp/rpd/cprpd1100m000" role="session">Items - Planning (cprpd1100m000)</GUIRef> session.</Paragraph>
		</GeneralSection>
		<Note><SectionTitle>Note</SectionTitle>
			<Paragraph>The phase number computation also checks for cycles in the bills of materials.</Paragraph>
		</Note>
	</GeneralSection>
	<RelatedTopics><SectionTitle>Related topics</SectionTitle>
		<RelTopic><Link href="/baanerp/cp/onlinemanual/000156" role="manual">Planning sequence and phase numbers</Link>
		</RelTopic>
		<RelTopic><Link href="/baanerp/cp/onlinemanual/000053" role="manual">To recompute phase numbers</Link>
		</RelTopic>
		<RelTopic><Link href="/baanerp/cp/onlinemanual/000055" role="manual">Net-change phase number computation</Link>
		</RelTopic>
		<RelTopic><Link href="/baanerp/cp/onlinemanual/000155" role="manual">To compute phase numbers for master-based planning</Link>
		</RelTopic>
	</RelatedTopics>
</ManualTopic>
