https://www.ibm.com/docs/en/ims/15.1.0?topic=api-dspapi-macro-access
IMS 15 - System programming APIs - DSPAPI macro access
In order to provide DBRC API (DSPAPI) macro access, your application must allocate IMS.SDFSRESL as either a JOBLIB or STEPLIB in your program's JCL because the...
system programmingimsapismacroaccess