Minimum amount tolerance for Vendor payment

Hi Experts,

We have set the tolerance limit for minimum amount for vendor payment on payment method level as well as company code level, yet the payment for an amount , which is below the tolerance limit can be made. How is it possible? Is this related to setting up off a error/warning message or anything missing somewhere from config point of view.

Also, despite of maintaining the House banks in vendor master and setting up the bank determination, the house banks are not selected automatically in payment proposal in F110.

Please throw some light on this.

Regards

Partha