The error message, error when posting nominal journal, is commonly received when a nominal code can't be validated in Dimensions. To narrow down the problem code, follow the steps below.
Click Payroll, and then click Nominal.
Click Update Nominal.
Don't select detailed expense postings or detailed bank postings.
Click Next.
The error message will now list the nominal code causing the error. Review the nominal code in Dimensions to confirm if it is correct or required.