I have a `Pipeline__c` object with fields `Segment__c`, `Status__c`, and `Sales_Date__c` (among many other fields).

I also have a `Sub_Pipeline__c` object which is related to `Pipeline__c`. Inside I have the following fields:

* `Pipeline_Project_Name__r`: Master-detail relationship with `Pipeline__c`
* `Segment_f__c`: formula field `TEXT(Pipeline_Project_Name__r.Segment__c)` (I do this because I want the value of `Segment__c` in `Sub_Pipeline__c` to be read-only.)
* `Status_f__c`: formula field `TEXT(Pipeline_Project_Name__r.Status__c)` (similar reason as above)
* `Term_f__c`: formula field similar to above, that derives its value from `Sales_Date__c` in `Pipeline__c`

I would like to create a query similar to the following:

```
SELECT Segment_f__c, Status_f__c, Term__c, SUM(Profit__c)
FROM Sub_Pipeline__c WHERE Fiscal_Year__c = '2018'
GROUP BY Segment_f__c, Status_f__c, Term__c

```

However, when I tried running this I got the error message

```
Field 'Segment_f__c' can not be grouped in a query call

```

This error message is the same for the other two fields as well.

Does this mean I cannot use formula fields in GROUP BY clause? If so, what should I do to get to the end-result I want?