@@ -12,6 +12,16 @@ You have created a [linked filter][linked-filter-gloss] so that (for example) if
If you are having problems with a regular [filter widget][filter-widget-gloss], please see [this guide](./filters.md). In order to fix problems with linked filters, you need a clear understanding of how they work:
## Does a connected dashboard card use a SQL variable?
**Root cause**: Native/SQL questions must have a [field filter](../questions/native-editor/sql-parameters.md#the-field-filter-variable-type) variable in order to be linked. Regular SQL variables won't work.
**Steps to take**:
1. Update the card's query to change the regular variable to a [field filter](../questions/native-editor/sql-parameters.md#the-field-filter-variable-type) variable.
See [Limitations of linking filters](../dashboards/filters.md#limitations-of-linking-filters)
## Do you understand the directionality of linked filters?
**Root cause:** Linked filters are one of the more complex features of Metabase, and many problems stems from misunderstanding their operation.
