Updating a complex projection

Summary

Modify existion complext projection to truncate responses returned

Content

I have a basic complex projection used to return the value of the gender question in the Diversity questionanswer. I need to modify the expression such that I can truncate the response, such that:

 

if Female return 'F'

if Male return 'M'

if I do not wish to respond... return ' '

Any hints are greatly appreciated.