# Why don't I have the option to "fill in missing rows"?

**URL:** <https://community.omni.co/t/why-dont-i-have-the-option-to-fill-in-missing-rows/88>\
**Category:** Workbooks\
**Created:** [June 3, 2024, 5:48pm UTC](https://community.omni.co/t/why-dont-i-have-the-option-to-fill-in-missing-rows/88 "2024-06-03T17:48:16Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![conner](https://yyz2.discourse-cdn.com/flex004/user_avatar/community.omni.co/conner/32/11_2.png) [@conner](https://community.omni.co/u/conner)\
**Post date:** [June 3, 2024, 5:48pm UTC](https://community.omni.co/t/why-dont-i-have-the-option-to-fill-in-missing-rows/88/1 "2024-06-03T17:48:16Z")

</div>

In order to [fill in missing rows](https://community.omni.co/t/whats-the-difference-between-dimension-fill-and-value-fill/83) on a dimension, Omni has to know the full set of values that the dimension can take.

For now, this means the dimension must be either a:

- [Group](https://docs.omni.co/docs/querying-and-sql/custom-fields/#binning-grouping-bucketing) (using Omni’s `Group` functionality)  

- Known list (e.g. day of week name)

- Date, bounded by filters (e.g. filtering for all dates in the year 2024 will fill in all days for 2024)