In Finland, suppose one is a light entrepreneur working with accounting service that do not provide right to sign for a corporation. Suppose a customer pays to cash. Then I read from https://www.finlex.fi/fi/ that the entrepreneur must write a receipt with business identity code.
Now if the light entrepreneur has no business identity code, can he take the cash payments legally? Can he for example replace the BIC by his or her social security number? Or what do the law says if he writes the receipt without BIC?