In calculations created for employees not subject to Railroad Retirement tax (RRTA), the deduction, benefit or paytype amount not subject to Social Security, but subject to RRTA, is reducing the Social Security Adjusted Gross amount.
Download and install the latest patch, which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch.
Work around: 1. Delete calculation 2. In Configuration > Deductions, benefits or paytypes, open the affected item and change the tax flag to RRTA to Do not reduce gross subject to RRTA 3. Calculate again.