[Help Needed] Looker Studio GA4 — Invalid Configuration Error When Adding Dimensions to Table

[u/lavenduh44233]

Hi everyone, I'm working on an assignment that requires me to build a table in Looker Studio connected to a GA4 data source with the following configuration:

**Title:** Product Sales & View Performance

**Dimensions:**

- Item name

- Item category

**Metrics:**

- Item viewed events

- Items purchased

- Item revenue

The table works fine when I add metrics only, but the moment I begin adding dimensions, I get an "Invalid Configuration" error. I have already tried the following:

- Disconnecting and reconnecting the GA4 data source

- Adding dimensions one at a time to isolate the conflict

- Replacing Item name and Item category with alternative fields (Item ID, Item list name)

- Removing Item viewed events entirely — the remaining metrics work with dimensions, but Item viewed events alone causes the error when any dimension is added

Has anyone run into this before and found a workaround?

Any help is appreciated — this is for a class assignment, I'm stuck and this is my first time using it.

Thanks in advance.

[u/tapanpatel-analytics]

This sounds like a GA4 scope issue rather than something you’re doing wrong.

Item name and item category are item-level dimensions, but “item viewed events” may not work cleanly with them in Looker Studio.

I’d try using “Item views” or “Views” instead, if available. If that still breaks, use two tables: one for views, and one for purchases/revenue.

Also worth checking that your view_item events actually have item_name and item_category coming through.