We use a single "Issues" list on our project sites to handle several different types of issues, identified by the Category field - New Defect, Risk, Pre-existing Defect, Change, etc. When we add a new issue, the ID is automatically generated by the system and is sequential regardless of Category. This means that Issue 1 could be a Defect, Issue 2 coudl be a Risk, Issue 3 could be a Change, etc.
Is it possible to add a custom, calculated ID field that would be specific to each Category? Therefore all "Defects" would have a sequential Custom ID (1, 2, 3, ...),. all Changes would have a sequential ID (1, 2, 3, ...), etc. even though they all exist within the same Issues list.
I know that each Category could be implemented as it's own list, but there are reasons we're trying to avoid doing that.
Project Server 2010