Bug report #21006
Expressions cannot be cleared/removed in attributes form properties
|Affected QGIS version:||3.4.3||Regression?:||No|
|Operating System:||Easy fix?:||No|
|Pull Request or Patch supplied:||No||Resolution:||duplicate|
|Crashes QGIS or corrupts data:||No||Copied to github as #:||28825|
I filled in "expression" in Constraints-attributes form by mistake. Now is impossible to eliminate any value (null or field name) from this "expression". So I have been obbligate to eliminate field and recreate another one.
I have tried this action on different fields but I had the same bug