assign caption in BQM

Hi All

I have created some workflow in BQM including the base tools "assign 
caption"
The idea is to store some information during the execution of the job.
But I have a concern using it:
  I created a job with the text "caption1 text" in the "assign caption" 
tool. the execution is correct, but when I restart DK, the "caption1 
text"  has disappeared from the "assign caption" tools of the job. My 
expectation is to get the "caption1 text" available for any further run 
of the job.

thanks for helping
frederic