Hi @GabrielaGut
You can use the UCase() function:
UCase("sample text here")
Use it together with the CoalesceEmpty() function if there are empty cells expected (to avoid unnecessary errors):
UCase(CoalesceEmpty([Measures].[Issue type],""))
You can read more about the available MDX functions here: MDX function reference.
Best regards,
Nauris / eazyBI support