" Update MRC schema itself "

I am applying a patch and I have to do the following as post patch step.

After applying any functional prerequisites...

You must complete these steps using AD Administration (adadmin):

• Generate message files.
• Compile APPS schema(s).
• Compile flexfield data in AOL tables.
• Compile menu information.

If you use Multiple Reporting Currencies; Maintain Multiple Reporting Currencies schema(s):
Enter Yes for the following options:

• Update MRC schema itself
• Compile invalid objects after updating MRC schema objects
• Recreate MRC triggers in the APPS schema(s)

I did most of the steps but not sure how to do the following :

• Update MRC schema itself