There should be an option to add additional text at the time of purchase requisition. Many time end user wants to add some additional information for vendor to take care (mainly in case of service work). Item description for services has limited text e.g Air Conditioner Maintenance here there should be option to add additional text option, and the same description shall be linked with PO so that it goes to vendor directly. everytime person making PO need not to discuss with PR person(end users) for additional information.