Should I use a lookup? How do I do this in a parameter expression?

Hi Everyone,

I have about 10+ shared data sets. All of these shared data sets queries have query parameter in them using a StaffCode:

'AND StaffCode IN(@StaffNameParameter)'

Or another variation

'AND S_Code IN(@StaffNameParameter)' (just different field names for the same staff code, wonderful, I know).

All was good and well until I received a requirement specifying that the Staff List parameter must default to the user accessing the report.

I was able to do this as my Staff List Data set brings in a 'LoginUser' field which I matched up against the User!UserID built in field.

StaffCode  StaffName       LoginUser
EXMPL01    Lovely Name     DOMAIN\lovelyname

However, when I changed my Parameter value to 'LoginUser' instead of 'StaffCode', all of my data sets were still pointing at 'StaffCode' instead of the updated parameter value 'LoginUser'.

Question: Is there any way to get around this other than trying to go back to all of my shared data sets and modifying their queries and joins?