SAP Message UMG311 - Background job was scheduled already. Please check status in TA SM37.

Diagnosis You tried to start a background job for the additional preparation stepsor you tried to execute one single step from the list of reports. Sincea background job is scheduled or active already, it is not possible torun a second job in parallel. Procedure Please wait until the first background job is finished. You can checkthe status of the background job in transaction SM37 (job name:UMG_PMIG_PREP_JOB).