Lock DCR until end of the workflow

System

Hi,

We have a requirement to keep edited dcr locked until the workflow ends. We are on TS6.1 SP1/W2K. We have external task as the start task. At the time of initiating the workflow we are seeing a key Icon on the dcr in UI. After hitting the first external task, workflow transitions to template based email task then user task. By the time workflow transitioned to user task the key Icon is gone, we are seeing pencil Icon.

I tried manually locking using iwlock clt from command line, still its behaving the same way... loosing lock. I also tried lock=t attribute for all user/group tasks. Still no use. Has anyone faced this problem before and any input in this regard is highly appreciated.

Thanks,
Krishna.