Hi @Micha Batelaan
Your req is: You want to create a external database and used it in your outsystems and want to update that row.
Step:1 create a external table and also create a row(Id) set as a primary key
step:2 go to integration studio and create a externsion and used in outsystem
step 3: and used (update cured) operation where u want to used and You need to pass the id of that record, if you don't pass it will be the same as you are creating a new record.
Thanks
Mansur