Diagnosis
You want to use a proportion / product unit for anitem.
You are not allowed to change the unit of measure into a proportion /product unit if:

• The following exist for a sales document item:

Preceding documents
Subsequent documents

• You are processing a scheduling agreement for the component supply
industry

• You change the target unit of measure in a scheduling agreement item
(and the sales unit is not a proportion / product unit)

• You are processing a customer requirements plan


• The following exist for a delivery item:

Preceding documents
Subsequent documents
Batch split items

• You are processing a batch split item

Procedure
Use a different unit of measure.
If you want to change the target unit of measure into a proportion /product unit in a scheduling agreement item, you need to change thesales unit accordingly. The system then sets the target unit of measureto the same as the sales unit.