Hi Andres!
For published metrics, that should be necessary. However, if the field you want to use is not an Apptio-defined "metric" (i.e.: a model or calculated metric that lives in the Metrics section in the Project Explorer instead of the Table section), I'd recommend re-publishing the dimensions (maybe start with the key ones that are already being measure across time, like QTD and YTD. There's likely a better way but I can't think of any off of the top of my head at the moment.
In case you don't have it, here is a Report Studio guide for R12 (Report Studio Guide v12.1) that may be helpful to reference, specifically, page 24 (I still refer to this guide from time to time). While it is a bit out of date, much of the content is still applicable.
Good luck!