<?xml version="1.0" encoding="utf-8"?>
<ManualTopic ID="/baanerp/cp/onlinemanual/000055" xml:lang="en">
	<Header>
		<Title xmlns:ssa="http://www.ssaglobal.com" xmlns:HTML="http://www.w3.org/TR/REC-html40">Net-change phase number computation</Title>
		<Keyword><Level1>Net-change phase number computation</Level1>
		</Keyword>
		<Keyword><Level1>Phase numbers</Level1>
			<Level2>net-change computation</Level2>
		</Keyword>
	</Header>
	<GeneralSection><Paragraph>The value of the <GUIRef href="/baanerp/cp/rpd/cprpd6200m000#runtype" role="formfield">Run Type</GUIRef> field in the <GUIRef href="/baanerp/cp/rpd/cprpd6200m000" role="session">Compute Phase Numbers (cprpd6200m000)</GUIRef> session determines whether a regenerative computation or a net-change computation is carried out.</Paragraph>
		<Paragraph>In a regenerative computation, each plan item's phase number is recomputed. In a net-change computation, not every plan item is recomputed.</Paragraph>
		<List><ListIntro>A net-change computation uses the following fields in the <GUIRef href="/baanerp/cp/rpd/cprpd1100m000" role="session">Items - Planning (cprpd1100m000)</GUIRef> session:</ListIntro>
			<ListItem><GUIRef href="/baanerp/cp/rpd/cprpd1100m000#cprpd100.sphc" role="formfield">Master Phase Number Parent</GUIRef>
			</ListItem>
			<ListItem><GUIRef href="/baanerp/cp/rpd/cprpd1100m000#cprpd100.phch" role="formfield">Order Phase Number Parent</GUIRef>
			</ListItem>
		</List>
		<Paragraph>When a new BOM line, BCM line, or supplying relationship is generated, SSA ERP automatically updates these fields with the phase number of the plan item's parent.</Paragraph>
		<Paragraph>When you carry out a net-change computation, SSA ERP compares the plan item's current phase number with the parent phase numbers stored in the <GUIRef href="/baanerp/cp/rpd/cprpd1100m000" role="session">Items - Planning (cprpd1100m000)</GUIRef> session. A plan item's phase number is recomputed only if the plan item's current phase number is less than or equal to the parent phase number.</Paragraph>
	</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/000155" role="manual">To compute phase numbers for master-based planning</Link>
		</RelTopic>
		<RelTopic><Link href="/baanerp/cp/onlinemanual/000054" role="manual">To compute phase numbers for order-based planning</Link>
		</RelTopic>
	</RelatedTopics>
</ManualTopic>
