When running the Management Reporter integration you receive messages in the Data Mart Integration logs that resemble the following:
Invalid object name 'Flexdef'
Value cannot be null. Parameter Name: dbinfo
These messages can occur when there are invalid records in the Company table in the SL system database.
To resolve this issue:
Run the follow against the SL system database in SQL Management Studio: Select * from company
Look for any records that have a blank 'databasename' field and delete them.