M56003 is a "container" hot fix that contains "member" hot fixes which will update your SAS software components.
See "What is a container hot fix?" in the SAS Hot Fix FAQ for more information on container and member hot fixes.
A manifest listing the contents of each of the following "member" hot fixes is available:
M40004 manifest for SAS Merchandise Intelligence Client 5.21_M3
M45004 manifest for SAS Merchandise Intelligence Grid Server 5.21_M3
M41004 manifest for SAS Merchandise Intelligence Mid-Tier 5.21_M3
M42004 manifest for SAS Merchandise Intelligence Plug-in for SAS Management Console 5.21_M3
M43004 manifest for SAS Merchandise Intelligence Workbench Server 5.21_M3
M44004 manifest for SAS Merchandise Solutions Configuration Workbench 5.21_M3