From 2105 when you add a new column in the Report List of a Fiori App the new field is not always displayed.
Reproducing the Issue
Open a Fiori App,
Manage Purchase Order, Manage Purchase Contract.
Go to Settings Icon and add additional fields in Columns Tab.
Go back to the result List , not all the new columns are displayed.
From 2105 due to a change on the CA-UI5 environment , a new button "Show details"/"Hide details" appears in the List Reports of the Fiori App.
If the number of columns to be displayed has exceeded the screen size , the new fields will appear after pressing " show details".
Press "Show details/Hide details" for displaying or hiding new fields.
Use the Sort of columns in the View Settings Icon in case you need to fix fields to be always displayed.
KBA , MM-FIO-PUR-PO , Fiori UI for Purchase Orders , CA-UI5-ST-LR , Fiori elements v2 List Report , MM-FIO-PUR-SQ-CON , Fiori UI for Manage Purchase Contracts , Problem