projection problem

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projection problem

eufass@tiscali.it
The Projection of my project is UTM32WGS (EPSG 32632)
Enable on the fly
projection

 if I load shapefile MonteMario (EPSG 3003) with
parameters:

+proj=tmerc +lat_0=0 +lon_0=9 +k=0.9996 +x_0=1500000
+y_0=0 +ellps=intl +towgs84=-104.1,-49.1,-9.9,0.971,-2.917,0.714,-11.68
+units=m +no_defs
the error is 70 meters


 if I load shapefile  with
SR personalized with the same parameters:

+proj=tmerc +lat_0=0
+lon_0=9 +k=0.9996 +x_0=1500000 +y_0=0 +ellps=intl +towgs84=-104.1,
-49.1,-9.9,0.971,-2.917,0.714,-11.68 +units=m +no_defs
the error is 1
meter

why?

thanks
Eugenio


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