RTSINPUT is what you are probably referring to.. copying from cube to planning area. If the job says no time series then probably nothing is being copied because the planning area is being read as "deinitialized" even though on the screen it looks green. This is a possibly. What is on screen is not necessary what happens in the background.
Open the SM12 t-code to see the lock arguments. Lock arguments are created based on locking method used for planning area and selection criteria that is being processed and the overlap - synchronous, asynchronous. The more detailed the lock argument, lesser the lock conflicts... a general rule.
The best bet is to talk to the ABAP person. Give him/her this challenge. esp. those learning still as experts may pretend to be busy.
Thanks
BS