# Lock

The action will lock a field selection.

![](https://4159443657-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-Lb8fteihZN5J-edUC8e%2F-LbWwP47ic6SvlfxGWPg%2F-LbWwQux3Itnsooi0mEo%2Fimage.png?alt=media\&token=cae1be30-798b-481d-a517-95aa217ddca0)

A Field can be entered manually or selected by clicking the <img src="https://4159443657-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-Lb8fteihZN5J-edUC8e%2F-LbWqlqwCahK9_Vh8bZR%2F-LbWqqA3M4yuV4ioisW9%2Fimage.png?alt=media&#x26;token=7e19bc48-6aa5-41a7-8ef8-b61c574fe359" alt="" data-size="original"> button.

A Qlik expression can be used in the “Field” parameter by prefixing it with an equals sign.