Child Support Additional Order amount getting deducted twice in biweekly payroll

Summary:

Child Support Additional Order amount getting deducted twice in biweekly payroll though the withholding amount is deducted only once.

Content (please ensure you mask any confidential information):

We have a customer asking for creating of non recurring element that has a feature as Child Support Special input in EBS for onetime use.

I have suggested to use Additional order amount (Enterable calculation value) as one time use for a period for child support involuntary deduction.

However, deduction is taking twice as soon as we add this enterable calculation value.

Ex : Addition Order amount : 500.00

After running quick pay, Involuntary deductions is showing as 1000.