Example of Backward Scheduling for External Procurement 

Example Data

Requirements date

31.10. (Monday)

Planned delivery time of the material

10 days (calendar days)

Processing time for purchasing

1 day (workdays)

Goods receipt processing time

2 days (workdays)

Opening period

10 days (workdays)

Workdays = Monday to Friday

  

Scheduling

  1. Requirements data minus goods receipt processing time = order finish date (provision date for vendor)

    2. 31.10. (Tuesday) minus 2 workdays = 27.10. (Friday)

  2. Order finish date minus planned delivery time minus processing time for purchasing = release date for purchase requisition or order start date of planned order for external procurement.

    3. 27.10. (Friday) minus 10 calendar days minus 1 workday = 16.10. (Monday)

  3. Release date minus opening period for planned order = opening date of planned order

16.10. (Monday) minus 10 workdays = 2.10. (Monday)