[AtlUmpSteve]

Does your contract give him the right to red-line? If so, does the contract not require him to do so in writing? As the booking secretary here, I would tell him that no other umpires are available that day. Personally, I would keep the assignment on principle, without regard to the threat of no pay; and send a copy of the check request, or whatever document is used in your state, to the school principal, the board of education, and the state association if/when he fails to pay it. If no such formal document exists, I would bring and tender an invoice for services rendered, and keep copies. Would probably also consider taking the school to small claims court, and might even try to file a mechanic's lien against the school property.