Automatic payment block

Hi,

We have a group of vendors for which we need automatic payment block to get populated as soon as we post their invoices through FB60. These vendors can be identified by the payment methods. I mean all these vendors for whom we need automatic payment block, will have a payment method "Z" configured in the vendor master.

Request you all to kindly suggest if this can be achieved through configuration or do we need some kind of substitution? Please explain the whole process in detail.

Regards

Ravish