Payment Program issues

Hi all...

when i am creating a automatic payment program in the parameters tab, when i am entering the vendor code range, iam not able to exclude some range of vendor codes, as it was possible in any other screen with multiple selection button.why the same is not available in APP parameters screen?

and even in free selection tab i am not able to exclude values for vendor codes? (in the field name column there is no field with name LFA1-LIFNR to exclude for the proposal?

and what payment medium Program and Payment transfer medium can be maintained in the customisation for the payment method T (Bank Transfer).

kindly give your valuable suggestions to fix these issues ASAP

i will assign points to each helpful answer

Thanks in advance

SRINU