This error means that the Accounting Code for this transaction has deductions that are not assigned to GL account.

How to check what account is missing:
- Click Properties menu
- Click Post submenu
- Click the Invoice order total $ amount
- Check what gl account is missing
To map or assign the GL account :
- Click Formulas menu
- Click Comm. GL # submenu
- Choose the accounting code from the dropdown
- Locate unassigned deduction under account
- assign by clicking the blank space and choose the account from the dropdown list
- Click save
When user go back to the property, it should be ready to post without any error