<?xml version="1.0" encoding="utf-8"?>
<ManualTopic ID="/baanerp/cp/onlinemanual/000316" xml:lang="en">
   <Header>
      <Title>Lead times and horizons</Title>
      <Keyword type="header" order="d1e210400">
         <Level1>Lead times and horizons</Level1>
      </Keyword>
      <Keyword type="header" order="d1e210403">
         <Level1>Horizons</Level1>
      </Keyword>
      <Keyword type="header" order="d1e210406">
         <Level1>Cumulative order lead time</Level1>
      </Keyword>
   </Header>
   <GeneralSection>
      <Paragraph>For a variety of reasons, it is often important to know how long it takes to
supply a particular item. Especially in manufacturing environments, where end
items are built from materials that can be either purchased or manufactured from
other materials, computing the total order lead time can be a complicated issue.</Paragraph>
      <Paragraph>In addition, in complex manufacturing environments it is important to use the
right horizons for the planning of your items. On the one hand, if these
horizons are too long, this can lead to unnecessary performance problems. On the
other hand, if they are too short, this can lead to problems in the explosion of
material requirements.</Paragraph>
      <List>
         <ListIntro>To deal with these issues, <GUIRef href="/baanerp/cp" role="package">Enterprise Planning</GUIRef> offers functionality for:</ListIntro>
         <ListItem>Calculation of a plan item's cumulative order lead time</ListItem>
         <ListItem>Checking and synchronization of order horizons for items throughout a BOM
structure.</ListItem>
      </List>
      <Paragraph>You can use the <GUIRef href="/baanerp/cp/rpd/cprpd1200m000" role="session">Check Horizons (cprpd1200m000)</GUIRef> session to access this functionality. You can
find this session on the <Link href="/baanerp/tc/glossary/glossary#specific" role="glossary">appropriate</Link> menu in the <GUIRef href="/baanerp/cp/rpd/cprpd1100m000" role="session">Items - Planning (cprpd1100m000)</GUIRef> session.</Paragraph>
      <List>
         <ListIntro>You can use this functionality in the following ways:</ListIntro>
         <ListItem>Check the various order horizons and planning horizons, and send the results
to a report.</ListItem>
         <ListItem>Update (correct) order horizons and planning horizons, but only if they are
too small.</ListItem>
         <ListItem>Update each order horizon and planning horizon, changing each horizon to its
minimal size (according to the rules that are applied).</ListItem>
      </List>
      <Paragraph>The minimum values for the order horizon and the planning horizon are displayed
in the <GUIRef href="/baanerp/cp/rpd/cprpd1100m000" role="session">Items - Planning (cprpd1100m000)</GUIRef> session. The underlying data on which these values are
based are updated when you check or update the horizons by using the <GUIRef href="/baanerp/cp/rpd/cprpd1200m000" role="session">Check Horizons (cprpd1200m000)</GUIRef> session.</Paragraph>
      <GeneralSection>
         <SectionTitle>Rules</SectionTitle>
         <List>
            <ListIntro>The horizons are checked or updated based on a number of rules. Two types of
rules can be distinguished:</ListIntro>
            <ListItem>Length rules that are based on cumulative order lead times</ListItem>
            <ListItem>A matching rule between horizons at various BOM levels</ListItem>
         </List>
      </GeneralSection>
   </GeneralSection>
   <RelatedTopics>
      <SectionTitle>Related topics</SectionTitle>
      <RelTopic>
         <Link href="/baanerp/cp/onlinemanual/000023" role="manual">Horizons and time fences</Link>
      </RelTopic>
      <RelTopic>
         <Link href="/baanerp/cp/onlinemanual/000317" role="manual">Cumulative order lead times and horizons</Link>
      </RelTopic>
      <RelTopic>
         <Link href="/baanerp/cp/onlinemanual/000318" role="manual">To synchronize order horizons between BOM levels</Link>
      </RelTopic>
      <RelTopic>
         <Link href="/baanerp/cp/onlinemanual/000407" role="manual">Time Zones in Enterprise Planning</Link>
      </RelTopic>
   </RelatedTopics>
</ManualTopic>