If you are getting an error message under the DB02 –> Missing Tables and Indexes –> Unknown Objects in ABAP Dictionary area, then you can follow the steps below to get rid of this error message for your SAP system.

To check the current situation goto following area ;

DB02 –> Missing Tables and Indexes –> Unknown Objects in ABAP Dictionary 

For our case, we are getting an Unknown Object for “DB Indexes” –> /1CPMB/CUDCGJR1~L1

Go to transaction SE11 and edit the related database table like shown below screen

Click the “Indexes” button

Now you will be able to see all the indexes for the related database table

As you can see, index /1CPMB/CUDCGJR1~L1 is not in the ACTIVE status

Select the index and just click the “Activate” button like below, after the process you will see the message “Active Object Generated”

Now you can go to DB02 and refresh the page to see the new status and finally you should see a screen like below