This functionality is possible: the data entry is a task and the checking is a task.
Let the second task (checking) have 2 transitions, one going back (to data entry) and one going further in the process.
Thank you for your reply...
I'm new in BPM area..
I'm also evaluated Oracle BPEL, what I understanding is that the product doesn't support recurrent process like this, unless to apply a while loop... Not sure how true it is but that's what I found.
for simple flows like this, you do not even need recursive (nested?) processes, but support for loops, which jbpm has to