Suggestions on handling vendors that have a few withhodling payments, but majority are not.

The situation is vendors that 80% of time are setup to process through a 3rd party and that company creates the 1099's, the payments are sent to them through paycycle.   20% of the time the vendors are paid regular payments and should be 1099 reportable.   Currently the vendors are marked as withhodling and they are class 07, so at year end there can be a large volume of vouchers that aren't 1099 but have all the withhodlings already posted.   The vouchers do not get updated when entered to set the withholding to N so it creates a large mess at 1099