In the SAP backend system, you maintain master data for a scheduling agreement because
gross demands for Supplier Managed Inventory (SMI) will be created based on this
scheduling agreement. This scheduling agreement is needed as basis for the goods receipt
posting and therefore as link for posting to accounts. Other process steps are built upon this,
such as invoice verification.
As there is no planning run that can create scheduling line items automatically (if
material is excluded from MRP), users have to maintain a “dummy” scheduling
line, otherwise goods receipt postings would be rejected.