The job report indicates that there is something wrong on SAP side.
Automic uses either the functionModule from SAP called 'BAPI_XBP_JOB_START_ASAP' -> option 'as soon as possible' or 'BAPI_XBP_JOB_START_IMMEDIATELY' -> 'immediately'.
Since you have selected the option 'as soon as possible' the functionModule 'BAPI_XBP_JOB_START_ASAP' is used.
So now the question is why SAP returns the message "Immediate start not currently possible"?
Please ask you SAP-Administrator to review this problem or open an OSS Call at SAP to resolve this.