If the rejection reads - 8374 - As there is an entry in any of [SSE36], [FSE100], [SPS25] or [FPS25] the sum of all instances [SSE31] + sum of all instances [FSE76] + [LUN52] + sum of all instances [SPS20] + sum of all instances [FPS20] - (sum of all instances [FSE102] + [LUN65] + sum of all instances [SPS27] + sum of all instances [FPS27]) should be less than [£6515]. Please check.

This rejection relates to the box on the tax return for paying class 2 voluntarily. This can only be ticked if the total income is less than £6515, if it exceeds this then you will need to untick the pay class 2 voluntarily.