Calendar Options, RSS, and Netting Logic
When you set RSS Calendar Option to 3 (no calendars) in Container/Shipper Control (7.9.24), Customer Data Maintenance (2.1.1), and Customer Scheduled Order Maintenance (7.3.13), you indicate that the system should not adjust the initial and final RSS dates by shop or customer calendars; however, if you set netting logic to 5, the system uses a calendar or calendars to determine the days over which to spread the excess planning quantity, regardless of how you set RSS Calendar Option.
When you create the RSS, the system processes requirement due dates by considering RSS Calendar Option settings and available calendars. Netting logic routines do not manipulate the requirements and dates at this point, unless planning ship/delivery pattern (SDP) codes or requirement authorization numbers (RANs) are involved.
When netting logic routines run, the system may move planning or shipping schedule requirements and dates. To prevent the requirements from ending up on inappropriate dates, the system moves requirements to appropriate dates, using the following calendar processing to re-sort the requirements and dates:
1 If RSS Calendar Option is 1, RSS uses the available shop and customer calendars to move requirements so that they end up on days when both the shop and customer are open.
2 If RSS Calendar Option is 2, RSS uses the available customer calendar to move requirements so that they end up on days when only the customer is open.
3 If RSS Calendar Option is 3, the system does not place dates with any calendar. The requirements are left on the dates upon which they were entered or received.
Using PCR Quantities with Netting Logic
Open MRP requirements are based on whether you set the customer order as cumulative or required. When set to cumulative, the system uses prior cumulative required (PCR) quantities and system cumulative planned and shipped quantities to determine the open MRP requirement.
Note: Cumulative-based users set Ship To Cum/Req to Cum in Customer Scheduled Order Maintenance (7.3.13), while requirements-based users set Ship to Cum/Req to Req.
The PCR quantity is the total quantity required prior to the prior cumulative date of the current release. By default, this is the last day of the previous release. Customers can send PCR quantities to you when they send schedule release information that you import into the system. You can specify the Prior Cum Date and manually enter shipping PCR, planning PCR, and RSS PCR quantities needed before the current schedule begins when you edit or create a schedule in:
• Customer Plan Schedule Maint (7.5.1)
• Customer Ship Schedule Maint (7.5.2)
• Required Ship Schedule Maint (7.5.3)
You can instruct the system to include the shipping and Planning PCR quantities as additional requirements to the current release when you create the RSS with Required Ship Schedule (7.5.5) Update or Selective Req Ship Sched Update (7.5.6). To do this, set the Use Ship/Plan PCR field in Customer Schedules Control (7.3.24) or Container/Shipper Control (7.9.24).
If cumulative-based users set netting logic to 3, they typically set Use Ship/Plan PCR to Yes. The following example depicts the RSS outcome with these settings.
Example: The shipping schedule release depicts week 1 and week 2 ship dates. The planning schedule covers week 1 through week 4. The overlap week, where planning and shipping calendars must be reconciled, is week 2. A planned PCR quantity of 100 and a shipped PCR quantity of 200 exist. The quantities are shown in
PRC Example.
PRC Example
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Week 1
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Week 2
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Week 3
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Week 4
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Shop Calendar
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M
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Tu
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W
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M
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Tu
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W
|
|
|
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Shipping Schedule
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10
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10
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10
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5
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5
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5
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|
|
|
|
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Planning Schedule
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50
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50
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50
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50
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|
PCR
Planned
Shipped
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100
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200
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|
|
|
|
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RSS
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10
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10
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10
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5
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5
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5
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155
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|
|
|
The 155 quantity adjustment on Monday of week 3 is based on:
planned quantities – ship quantities.
In the example, 155 = 300 planned quantities – 145 shipped quantities, where:
300 = plan PCR 200 + week 1 plan 50 + week 2 plan 50
145 = ship PCR 100 + week 1 ship 30 + week 2 ship 15
The plan and ship quantities are totals from the prior cum date to the last day of the last overlap week. In the example, the prior cum date is the day before Week 1 begins.