You can't change a model in a story based on live connection in SAC.
SAP Analytics Cloud.
Reproducing the Issue
- Login into SAC.
- Go to Stories.
- Create a new story based on a live connection.
- Go to Data
- Try to change the >> Model substitution icon is disabled.
This behavior is by design.
An enhancement request has been submitted to the 'Ideas Place' for future considerations on below link:
SAPCloudAnalytics, SAP Analytics Cloud, System, Data, User, File, CloudAnalytics, feature, Cloud for Analytics , KBA , LOD-ANA-DES , Story Design & Visualizations , Problem
SAP Analytics Cloud 1.0