-The primary key for the data source should be defined in [`columns`](https://help.syncfusion.com/api/angular/ejgrid#members:columns "columns") definition, for editing to work properly. In [`columns`](https://help.syncfusion.com/api/angular/ejgrid#members:columns "columns") definition, particular primary column's [`isPrimaryKey`](https://help.syncfusion.com/api/angular/ejgrid#members:columns-isprimarykey "isPrimaryKey") property should be set to `true`. Refer the Knowledge base [link](http://www.syncfusion.com/kb/2675/cant-edit-any-row-except-the-first-row-in-grid# "link") for more information.
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