OK Sorin,
Steps are:
1. Create a IP30 variant for this plan.
2. Create a Background job through Tcode SM36, giving the RISTRA20 variant (i.e, IP30 variant), and the periodic values at which you want to Run IP30 (RISTRA20) and Save.
3. Through SM37 you will be able to monitor the schedule status.
4. Whenever you want to discontinue this Background scheduling, Delete the Released line item of this job in SM37.
Jogeswara Rao K