Please, create a calc in the Table 1 like this:
TRIM( SPLIT( [ArtNo], " ", 1 ) )
and do blend on it.
Hope it helps.
thank you very much for your answer.
That's a great idea, but in this case it do not work because iin table1 it's "XL 1" AND "XL 2"
Now I created a calc like this:
when "XY 1" then "XL"
when "XY2" then "XY"