Ignore Master item in set analysis

[sophie_bd]

Hello,

how to ignore a Master Item like this : Code site et libellé =SiteCode & '-' & SiteLibelle ? 

I have try :

min({<[Code site et libellé]=>} Period_Date)

min({<SiteCode,SiteLibelle>} Period_Date)

but nothing work ...

Thanks for your help.

Sophie

[pradosh_thakur]

min({<[SiteCode]=,[SiteLibelle]=>} Period_Date)