Change segment numerosity of an IDoc

Xi experts,

I have a file --> xi --> idoc scenario in which I have to populate COND_A idoc.

The COND_A structure is:

IDOC

---- EDI_DC40  maxoccurs 1

---- E1KOMG  maxoccurs 1

.....

.....

Is possible to change maxoccurs of E1KOMG to maxouccurs: unbounded working on XSD scheme?

Or it raise an error when creating the IDOC?

thanks

fabio