Hi Charles ,
Please check if the app you are installing from the EMS store and the Datamodel you are assigning to it - are correct ( i.e. The app is built on a standard ERP data model ).
 
If your need is : 
You want to use the EMS store app on a Customized Data Model which you might have built - you need to modify the existing Activity Table and case table & column references with your Activity/Case table/column name.
e.g.: if App is referring the activity table named: _CEL_AP_ACTIVITITIES and AP_INVOICE_CASE_TABLE  - you need to change the referencs with  the activity Tablename and case table name which you have developed as a part of the solution.
_CEL_AP_ACTIVITITIES   in the analysis reference to be replaced with - the activity table you created 
AP_INVOICE_CASE_TABLE  in the analysis reference to be replaced with - the case table you have created.
 
Hope this helps!
 
Regards
Ayan Bandyopadhyay
 
                
     
                                    
            Hi @charles.picot I agree with @ayan.bandy12 solution.
 
The error message which you are getting is because of that table missing in data model.
 
It is important to check that data model which you have assigned is correctly matched with the app which you have installed from EMS store.
 
You also need to check the KPI formula logic used for Double_invoice_indicator.
 
You can check that in saved formula in celonis Analysis.
 
And yes make sure your analysis reference is correctly replaced  with - the activity table you created and the case table you have created.
 
 
Hope it helps.