You have created a new report and when you try to add a field via the "Add Fields" feature you notice that the checkbox is greyed out and cannot be selected.
SAP Cloud for Customer
SAP Business ByDesign
Reproducing the Issue
Go to the Business Analytics work center.
Open a custom report.
Select the Add Fields feature.
Find the field you wish to add and you will notice the checkbox is not selectable.
You have a Fixed Value Selection on that specific field in your report.
For the checkbox to be available you will need to remove the Fixed Value Selection.
Select the value "No Value Selection" to be able to add the field in the report.
Fixed Value Selection, Report, Add Fields, Checkbox, Check Box, , KBA , AP-RC-ANA , C4C, ByD, Travel: Analytics Tools & Frameworks , How To