The allocation retrieval list must be below the 16 MB line, but the allocation return area can be above the 16 MB line.

When you are finished obtaining information from the retrieval areas, free the storage with a FREEMAIN or STORAGE macro.

You can use the IHAARL macro to generate and map the allocation retrieval list. For more information about the IHAARL macro see z/OS DFSMSdfp Advanced Services.