When making an adjustment for a Project Expense where you are changing a dimension you might encounter an error message that says
‘Account number for transaction type Ledger journal does not exist’
‘Posting has been cancelled’
once you post the adjustment
If you receive this message, try to go to Project Management and Accounting\Setup\Posting\Default offset accounts for expenses and note if you have specified any account here. If it is not the case, enter an account for the desired combination and try to see if you can not do your adjustment posting now