When a 'Given anonymously' is checked on a recurring gift added to a constituent record and you then import a payment for that recurring gift the anonymous flag isn't set for the payment.
We are currently evaluating this issue for a fix in a future service pack.
Steps to Duplicate
1. Search and select for a constituent record, on the Personal info tab ensure the 'Gives anonymously' is NOT set. 2. From Tasks menu add a recurring gift 3. Create .csv file to import a payment for the above recurring gift 4. Go to Administraion and click on Import task and add a new import process using an ERB template 5. Use the .csv file you created and map the fields including the revenue streams collection field 6. Process the import and commit the batch created from it