Issue with salary display in Total Compensation statement

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We have a following issue with display of salary in Total Compensation statement: our client uses a monthly salary basis. But the Total Compensation Statement shows only the annual salary. Moreover, if the employee's salary was changed several times during the year, the system does not calculate that the first 6 months the employee had one salary, then 4 months another salary and last 2 months for example a third salary. The system simply multiplies the monthly salary by 12 and displays the sum of 3 annualized salaries.

Our client does not use the payroll module, but we have set monthly payroll dates in payroll definitions.