SAP Message AJ014 - An optional schema step was only assigned values for part of the period

Diagnosis Operand &v1& is used as an input operand for an optional schema step.However, the operand was assigned an operand value for only part of thebilling period. System Response An error has occurred because execution of an optional schema step isnot defined for operands that are only assigned for part of a period. Procedure Check that operand &v1& of the schema step for the billing period &v2&to &v3& is assigned completely or not at all. (Note: for additionalinformation, refer to the details to this message.)