Unable to use "Date_earned" context in Global Absence Accrual Matrix fast formula

Summary:

We need to read a particular element entry inside the global absence accrual matrix fast formula and hence I need to use a context statement to read it.

Local_variable= GET_CONTEXT(DATE_EARNED, '4712/12/31 00:00:00' (date))
l_light_duty = HG_PR_LIGHT_DUTY_HOURS_ASG_ENTRY_VALUE

Tried with below statements and it does not fetch any data

change_contexts(DATE_EARNED=stop_date)
l_light_duty = HG_PR_LIGHT_DUTY_HOURS_ASG_ENTRY_VALUE

Content (please ensure you mask any confidential information):

Formula compiles but I get an error while running the absence accrual. It seems the formula keeps throwing me error to set the context even though I have already set. Any suggestion to get past it