Define an accrual matrix based on their work shift

Summary:

Define an accrual matrix based on employees work shift.

Content (please ensure you mask any confidential information):

Hello!

We have a requirement to accrue hours same as their shift duration for a front loaded plan.

As of 1/1/2024, If an employee is assigned a 10hr shift, accrual must be 10.
As of 1/1/2024, If an employee is assigned a 8hr shift, accrual must be 8.

I tried using an accrual fast formula (as below) but it is returning 0 hours. Any ideas will be appreciated.

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DEFAULT FOR IV_ACCRUALPERIODSTARTDATE IS '4712/12/31 00:00:00' (date)
DEFAULT FOR IV_ACCRUALPERIODENDDATE IS '4712/12/31 00:00:00' (date)
DEFAULT FOR IV_ACCRUAL IS 0