Work-items are not completed in worflow

Hi ,

We are facing a issue when the work-item are sent to concern user business

workplace & then when user clicks on dailog work-item to process it ,

the work-items goes to processing status for long time & remains in

same status , though the asset number is created in background at

business object level.

Below is the flow of the workflow.

1) Loan order is created & delivery is created with available equipment

2) After PGI asset will been created in back ground mode.

3) If the equipment is returned then we create a return order ,

return delivery ,PGR & deactivate the asset number .

4) Now If the same equipment is sent to any another customer then

again a loan order , delivery is created with same equipment & PGI .

5) while creating a asset it will send a work-item to user inbox in

dialog mode with asset number & suffix _A , now the problem is when users

double clicks on the work-item it goes into processing mode for long time though the

asset number is created in back ground & remains in the user business workplace .

There is no error in workflow at business object level or agent assignment at task level.

Can any one advice pls...