Workflow testing

Hi,

I am new to workflow.. now i have a ticket in ESS web portal. If user cancel his leave .the approver not able to approve or reject.

it is trigerring the error "you want to debug? "

and terminating the flow for the approver.

How i can check the workflow? what are the Tcode authorzation i want to test the workflow?

Points to be given for valid answers.

Thanks in advance

Regards,

Nandha