SAP Message AH874 - IF-ELSE-ENDIF clause contains different seasons

Diagnosis
A different season operand is set in the IF variant of rate step &v1&than in the corresponding ELSE and ENDIF variant in rate step &v2&.
This is not allowed because IF-ELSE-ENDIF clauses always have to beexecuted together.

System Response
The rate cannot be saved.

Procedure
Please set the same value for the season operand for all related IF,ELSE, and ENDIF steps in the rate.