Aide sur champ (CUMREP) 

The initialization formula is used to 'initialize' a total on the first payroll. If this field is specified, the total will be assigned to the value resulting from the initialization formula assessment. This formula can refer to a heading, a variable, a total and / or an employee field.

If a variable is used here, make sure that it is associated with an entry page of folder, company, site or employee level.