The Writeback Grid visual displays a grid with the data in your dataset. In this tab we have two different categories to add fields:
This is the list of columns to display in the grid. Drag and drop fields from the dataset into this list to see the values. In order for the write-back transaction to work, it’s necessary to always include a unique identifier or primary key column.
This category contains the (mostly) descriptive fields to be mapped to another (mostly) key field for the drop-down menu to support linked dimensions. For a more detailed explanation of this featured see the section Column mapping