I have always wondered why we need to change the settings for our asset accounting number range from external assignment to internal assignment when upgrading from 4.7 to ECC 6.0. Now I've also noticed that after changing the settings from external to internal number assignment, the system cannot recognize the next available number to be assigned when I run the depreciation run. Therefore, it would revert back to the first number in the number range instead of the next available number. This leads to the discontinuing of the document number assignment for assets. Can someone please explain the logic behind these changes so we can better understand the system's behavior? Thank you very much!