Sorry It’s my mistake. I find the way to create supplier object. Use
ISupplier supplier = (ISupplier) session.createObject(SupplierConstants.CLASS_DISTRIBUTOR,params); 
It can be create, because the CLASS_DISTRIBUTOR I don’t know this key word so I can’t create it.
The problem it’s solved thanks

If you need to add new step in current active workflow, it’s not possible.
The system will tell you  the workflow in use.
You need to  create the new workflow to setting, I think it’s the one of 
weakness for PLM system,it’s not friendly to user because the workflow 
has often change(ex. organization reshuffle、production change…)
and you need to create workflow、workflow criteria setting、
approver setting, privilege modify change setting, and if you have the
program to check the workflow or auto set some value through to workflow,
you also need to setting the Events and Event Subscribers…….not friendly
 

Dear Kevin

Thanks a lot for your support. 
Your answer can satisfy our requirement.

Best Regards
Tony

IItem item =  (IItem)session.getObject(IItem.OBJECT.TYPE, ITEMNUMBER);
item.getvalue(ItemConstants.ATT_TITLE_BLOCK_REV);

IItem is the agile API interface, not object.

I have the same issue before,  I use the event trigger through Save as Event PX , but It must be notice if the old change name:ECO-001, the save as change name :ECO-002. the program get the dataObject is ECO-001. if you want to clean the ECO-002 some attribute where the data is from ECO-001,  currently I get the ECO-001 history  table, and the condition is Action status is Save as and get the Affected Object , it can get the ECO-002.

Thanks a lot for your help. I got the comment through API , But I have the new question,

the originally I want to generate the last week release change’s comment for end user,

they tell me their request is last week through  him/her change comment, not last week release change,

So currently I have no idea how to implement it.

and the sql solution I will try to join these table….Thanks