Class 1A NICs not processing through to FPS

Summary:

We have Standard Car and Car Processor enabled for taxable benefit payroll processing. We also have several custom benefit in kind elements. All are feeding the 'NIable Earnings for Class 1A NICs' balance.

The FPS is registering 0 for 209 Real Time Class 1A NICs, for every row. Is there an additional setup required to process these through? It is unusual that the standard Car and Car processor is not generating values, when the payroll run results are showing calculated cash equivalent and BIK.

The oracle documentation 2409034.1 does not have mapping for class 1A - would expect to see this in the list.