i believe the snswer is to obtain a re-entry permit, but wanted to confirm.
my friend has a visa type is a NON-IMM category B - number of entry: SINGLE. The stamp in his passport on the opposite page states 12th May, valid until 9th August.
he has a short weekend trip planned to Taiwan and then return to Thailand -- to avoid cancelling his visa, i told him he must obtain a re-entry permit before departing. was my advice correct?
my friend is in bkk, and has a Singapore passport.
thank you for any advice