Z-field to be saved in VBRK while invoice creation(VF01 and VF11)

Hi Experts,

I have a requirement where I have to save the data in some Z field while VF01 and VF11.

This Z field will appear in VBRK table.

I have checked some exits like RV60AFZZ and RV60AFZC but no success.Some exits don't trigger during VF11(like USEREXIT_FILL_VBRK_VBRP).I don't want to put the logic in accounting exits since there I can modify only VBRP and not VBRK.

Kindly help.