In one of my customers scenarios there is a milestone billing which is attached to a project. Once the milestone is confirmed, the billing block gets removed from the header as well as item in sales order and thereafter collective billing is generated. But presently out of the 170 odd sales orders for which a particular milestone is confirmed, in around 70 the billing block is getting removed from the header but not at the item level, which is quite unusual. As a result billing could not be generated collectively for all those sales orders. Kindly suggest whether this is because of data inconsistency or is it because of something else. Please also share if somebody has faced similar problem.