You can avoid the allocation messages to spool by using a JOB statement with MSGLEVEL=(1,0) for your CA Vantage SRM started task.
For example, see the IBM manual Z/OS V1R13 or higher JCL Reference sections:
22.214.171.124 Alternative 1 -Add the Member and JCL to the IEFJOBS-Defined Data set
126.96.36.199 Alternative 2 -Add the Job JCL to the Existing Procedure
188.8.131.52 Alternative 3 -Add the Member and Invoke a Procedure in Another DD Concatenation