Summary:

When creating a new field in the company entity (comp_accountid) then adding it to the company grid, it is not displayed on the find screen.

Resolution / Workaround:

Call the new field a different name, for example comp_account_id.

Status:

This is by Design as (prefix)_accountid is reserved for CRM fields.

More information:

This seems to be affecting all with the (prefix)_accountid like pers_accountid.