Finland SEPA payment requirements – Reference/Roll # required -- what do you enter for employees?

Hi –

For Finnish SEPA payments, when setting up a bank account for A/P payments, it is required that the Reference/Roll Number be completed with the vendor’s business ID.  What do you enter in this field for Employees that will have their expenses paid via A/P?  For security reasons, we would rather not enter the employee ID #.  Also, is the field validated for format?  

Thanks,

Amy