Google Docs (Spreadsheet) tells me that this (custom) formula is wrong.. in Excel instead works:
=AND(MATCH(CONCATENATE($A2;" ";$B2);Allievi!$G$1:$G$1204;0); $L2="Facilitatore di classe")
It just tells me it's not valid. The problem is that it seems not possible to reference other sheets (in the same doc) in conditional formatting rules..
Any workaround? I need to keep data in different sheets.