SAP Message 29237 - At least one allocation must exist for each alternative/variant

Diagnosis
You want to delete plant allocations for a BOM and have selected allcurrent allocations.

System Response
The system checks that at least one allocation exists for eachalternative/variant.

Procedure
Please check the selected allocations.
You cannot delete all the selected allocations.
You have to deselect at least one allocation before you can delete theothers.