REINDAT and VATDATE update

Hi Expert,

I am building SII solution for Spain, I noticed that SII XML needs the REINDAT and VATDATE in BKPF table to fill certains tag

When I am creating a vendor invoice by FB60 for example, it is not updated at all.

I don't know usually how they will be updated, do I have to put a user exit for that or they can be updated during a standard process with some customizing.

Can you help? thanks,