SAP Message UCF1006 - Only a maximum of &2 'per sender' characteristics can be used

Diagnosis
You selected the "per sender" indicator for the entry of explicit datafor the distribution key for &V1& characteristics. However, thisindicator can only be selected for a maximum of &V2& characteristicsfor the distribution key with explicit data.

System Response
The explicit data for the distribution key cannot be recorded.

Procedure
Select "per sender" only for a maximum of &V2& characteristics.