I'm using new matrix since it allows to click and filter the page elemnts (not possible in other matrixs).
To have a flat format, I put all my fileds in value group insted of row goup, but this seems to change some information.
LAYOUT 1
PM field in in the row goup
WORK_ID = 1035
PM = Casabianca Giovanni (correct)
LAYOUT 2
PM field in in the column goup
WORK_ID = 1035
PM = Alvino Stefania (correct)
WORK_ID and PM are fileds of different table with a relationship 1-1.