We have IS-OIL installation and use very limited functionality. The two areas we use for the F&A pricing and the Invoice process. I would like to hear from other people familiar with this functionality, if the customers get both the provisional invoice and the differential invoice. We have gone live since Feb 2007 and have a lot of AR issues around this provisional/final billing process. Reason being, our customers want to see only one billing document. The output for provisional invoice was turned off (customer does not get a copy). And the output for the final invoice was modified to include the amount in the provisional Invoice. This is causing a lot of issues in AR. I would like to hear from others who have IS-OIL functionality and use the billing process, what your customers receive. Basically, I want to know that the best business practise is.