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
- Requirements data minus goods receipt processing time = order finish date (provision date for vendor)
31.10. (Tuesday) minus 2 workdays = 27.10. (Friday)
- 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.
27.10. (Friday) minus 10 calendar days minus 1 workday = 16.10. (Monday)
- Release date minus opening period for planned order = opening date of planned order
16.10. (Monday) minus 10 workdays = 2.10. (Monday)