Hi people of thailand , i have an non b visa togetber with workpermit, which expire 20/10/2017 ,my notify of adress runs till 22 /10 , i leave on 20/9/2017 to visit belgium , i dont have a multiple entry , i know before you leave you have to get a stamp for re entry , but i saw on the document you have to fill in your return date to thailand !! Is this an obligation because i dont know when i will come back