When mapping nominal codes we noticed that the pay code listed as “NET PAY” within the journal doesn’t exist within the pay codes section.
Through trial and error, we managed to work out that you need to put the nominal code you want aligned to "NET PAY" in the pay code “SALARY” to pull through to “NET PAY” on the journal which doesn't make a lot of sense particularly as all other pay codes on the journal have a corresponding pay code of the same name that matches word for word.
We have raised with support as an issue as confused as to why this one would be set up differently and under a contradicting description (salary is typically a term connected with gross unless specifically a grossed up net salary) and have been advised to raise an idea to correct this error.