Cannot select a record in Customer parameters (CustParameters). An unsupported NULL value has been selected from the database."

Recently our customer came up with one of the issues,  the issue was that some of the users where not able to access the Sales order and Customer master data. They use to get this message:

"Cannot select a record in Customer parameters (CustParameters). An unsupported NULL value has been selected from the database."

The reason was usage data, there was something wrong with their usage data. I tried to clear the usage data and close AX and open again, issue was resolved.

Steps to clear usage data:

1. Open AX
2. Go to Tools
3. Select Option
4. Click "Usage Data"
5. In th General tab click "Reset" (Note that all the user changes will be gone after reset).