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<ManualTopic ID="/baanerp/cp/onlinemanual/000155" 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 master-based planning</Title>
		<Keyword><Level1>Phase numbers</Level1>
			<Level2>computing for master-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 <Link href="/baanerp/cp/glossary/glossary#000059" role="glossary">master planning</Link> on the following data:</ListIntro>
			<ListItem><Link href="/baanerp/ti/glossary/glossary#000081" role="glossary">Bill of critical materials</Link> (BCM)</ListItem>
			<ListItem><Link href="/baanerp/cp/glossary/glossary#000005" role="glossary">Supplying relationships</Link>
			</ListItem>
		</List>
		<List><ListIntro>SSA ERP computes phase numbers for</ListIntro>
			<ListItem>Plan units (and the plan items that belong to it)</ListItem>
			<ListItem>Plan items that are not part of any plan unit</ListItem>
		</List>
		<Paragraph>In the master-planning process, an item that is not part of any plan unit is treated as a plan unit of its own.</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 two plan items are in different plan units, and one of these plan items is defined as a component of the other in a BCM, the phase number of the component's plan unit must be greater than the phase number of the parent's plan unit.</ListItem>
				<ListItem>If a supplying relationship exists between two plan items that belong to the same site, the phase number of the supplying item's plan unit must be greater than the phase number of the receiving item's plan unit.</ListItem>
				<ListItem>If a supplying relationship exists between two plan items that belong to different sites, and both items are controlled by central multisite planning, the phase number of the supplying item's plan unit must be greater than the phase number of the receiving item's plan unit.</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>
		<Paragraph>Similar criteria apply to plan items without plan units except SSA ERP uses the phase number of the plan item instead of the phase number of the plan item's plan unit.</Paragraph>
		<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 unit and every plan item without a plan unit initially gets phase number 0. SSA ERP then checks the plan units and plan items without a plan unit 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>
			<GeneralSection ID="A"><SectionTitle>Example</SectionTitle>
				<Paragraph>Consider the following bill of critical materials with seven items:</Paragraph>
				<Figure><HTML:IMG SRC="../images/nt_flow_000155.gif" height="188" width="368" xmlns:ssa="http://www.ssaglobal.com" xmlns:HTML="http://www.w3.org/TR/REC-html40"/></Figure>
				<Paragraph>Items A_1 belongs to plan unit 1, B_2 belongs to plan unit 2, and so on.</Paragraph>
				<Paragraph>The computation yields the following result:</Paragraph>
				<TABLE border="1"><TBODY><TR><TH>Plan item</TH>
							<TH>Plan unit</TH>
							<TH>Phase number</TH>
						</TR>
						<TR><TD>A_1</TD>
							<TD>1</TD>
							<TD>0</TD>
						</TR>
						<TR><TD>B_2</TD>
							<TD>2</TD>
							<TD>1</TD>
						</TR>
						<TR><TD>C_4</TD>
							<TD>4</TD>
							<TD>2</TD>
						</TR>
						<TR><TD>D_4</TD>
							<TD>4</TD>
							<TD>2</TD>
						</TR>
						<TR><TD>E_4</TD>
							<TD>4</TD>
							<TD>2</TD>
						</TR>
						<TR><TD>F_3</TD>
							<TD>3</TD>
							<TD>3</TD>
						</TR>
						<TR><TD>G_3</TD>
							<TD>3</TD>
							<TD>3</TD>
						</TR>
					</TBODY>
				</TABLE>
			</GeneralSection>
			<Paragraph>You can see the result of the computation in the <GUIRef href="/baanerp/cp/rpd/cprpd6100m000#cprpd600.phnu" role="field">Master Phase Number</GUIRef> field in the <GUIRef href="/baanerp/cp/rpd/cprpd6100m000" role="session">Plan Unit (cprpd6100m000)</GUIRef> session for plan units and in the <GUIRef href="/baanerp/cp/rpd/cprpd1100m000#cprpd100.phnu" role="field">Master Phase Number</GUIRef> field in the <GUIRef href="/baanerp/cp/rpd/cprpd1100m000" role="session">Items - Planning (cprpd1100m000)</GUIRef> session for plan items without plan unit.</Paragraph>
		</GeneralSection>
		<Note><SectionTitle>Note</SectionTitle>
			<Paragraph>The phase number computation also checks for cycles in the bills of critical 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/000054" role="manual">To compute phase numbers for order-based planning</Link>
		</RelTopic>
		<RelTopic><Link href="/baanerp/cp/onlinemanual/000025" role="manual">Plan units in Enterprise Planning</Link>
		</RelTopic>
	</RelatedTopics>
</ManualTopic>
