How to Set context before writing While loop in oracle Formula

Summary:

I have a requirement to check element, with input values paid to employee during year.

So before writing the while loop, i was setting the effective date context like below, but while loop is only checking the elements attached during current payroll period. Can anybody help me how to find the element input value or run result value of particular element with input values ( pay Value, Date From, Date to )

change_contexts(EFFECTIVE_DATE = l_year_paystart_date,HR_ASSIGNMENT_ID = hr_id )

(

WHILE (ELEMENT_ENTRY_BASE_ELEMENT_NAME.EXISTS(l_cnt))LOOP

(

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