10000470 
Message
Enter date in "Posting Date" column
Diagnosis
In the 
Administration 
System Initialization Opening Balances 1099 Opening Balance 
path, you have created a 1099 Opening Balance report.
You have attempted to add a new row or update an existing row where the Posting Date column is empty. You have chosen Update.
Procedure
In the 1099 Opening Balance window, in the Posting Date column, make sure you have entered a date value.