This means that the Funding Source attached to the Collateral Debt Note does not have all of its GL Setup populated.
1. Look up the Funding Source account and go to the Account Main Screen
2. Go to the "GL Setup" tab
3. You will notice that some, if not all, of the GL interfaces do not have a GL Account populated. These must be populated in order to successfully book your Collateral Debt Note record.
4. Add the necessary GL Accounts to the Funding Source's configuration and save the changes.
5. Then try to book the Collateral Debt Note again.