func (pen PrivateEnterpriseNumber) Validate() error {
	if pen <= 0 { // 0 is reserved
		return fmt.Errorf("must be positive integer")
	}
	return nil
}
// Validate ensures that the number is correct.
Validate ensures that the number is correct.
// Validate ensures that the number is correct .
func (pen PrivateEnterpriseNumber) Validate() error {
	if pen <= 0 { 
		return fmt.Errorf("must be positive integer")
	}
	return nil
}
func ( pen PrivateEnterpriseNumber ) Validate ( ) error { if pen <= 0 { return fmt . Errorf ( " " ) } return nil }
Validate ensures that the number is correct.
Validate ensures that the number is correct .
// 0 is reserved