SAP Message C4100 - Only one value can be selected for &

Diagnosis
You have selected more than one value for a characteristic in a matrix.This is not allowed because the characteristic is a single-valuecharacteristic.

System Response
The system checks whether the Single-value or Multiplevalues indicator is set in characteristics maintenance for thischaracteristic. You can only assign one value to a single-valuecharacteristic.

Procedure
Please select only one value.