Post year end: Enter payments message re some employees not having been updated

Hi

I did my payroll year end last week and processed week 1 pay.

I'm getting the following message in ENTER PAYMENTS for week 2 :

     Some of your selected employees have not been updated for the last period of the 2019/2020 tax year.

     Processing and updating them in the 2020/2021 tax year will make some of the previous year’s YTD read only.

Is this to do with my one employee on hold?

I think I should have included them in my first FPS of the new year, but I didn't.

Will including them in an FPS/FPS adjustment resolve the problem?

If so, can I included them on week 2 FPS or can I submit an FPS adjustment for that one employee only instead?

Thanks in advance

Karen