i want to add the new field to the prodroutetable and data should be show in routeinventprod form but i got field in frontend and save but when i refresh the page data will be disappear why?please give me solution

i want to add the new field to the prodroutetable and data should be show in routeinventprod form but i got field in frontend and save but when i refresh the page data will be disappear why?please give me solution. i tried with table extension with update method and datasource eventhandler with onwriting and onmodified but doesn't work