Fifa container call many external files (like adbords and bench player...):
for fifa12 external files are:
SidelineCamera
Alpha3
Weather
GlowMask
MainStadium
NorthZone
StadiumWear
EnvironmentSkirt
CollisionGeometry
SouthZone
Alpha2
Banner
Default
CrowdNet
AdBoard
SidelineProps
Jumbotron
for fifa13 external files are:
SidelineCamera
Banner_ShadowAlpha
Jumbotron_ShadowAlpha
Alpha3
Weather
Roof_NoShadowCast
GlowMask
SidelineCamera_ShadowAlpha
Alpha2_NoShadowCast
Pitch_ShadowAlpha
MainStadium
Weather_NoShadowCast
StadiumWear_NoShadowCast
AdBoard_NoShadowCast
SidelineProps_ShadowAlpha
Jumbotron_NoShadowCast
Weather_ShadowAlpha
SidelineCamera_NoShadowCast
Roof_ShadowAlpha
NorthZone
Alpha3_NoShadowCast
SidelineProps_NoShadowCast
StadiumWear
SouthZone_ShadowAlpha
EnvironmentSkirt
GlowMask_NoShadowCast
Alpha_NoShadowCast
NorthZone_NoShadowCast
Banner_NoShadowCast
Default_ShadowAlpha
CollisionGeometry
SouthZone
StadiumWear_ShadowAlpha
Alpha2
Banner
Alpha3_ShadowAlpha
CrowdNet_NoShadowCast
Pitch_NoShadowCast
AdBoard_ShadowAlpha
EnvironmentSkirt_ShadowAlpha
GlowMask_ShadowAlpha
Default
CrowdNet
CrowdNet_ShadowAlpha
Default_NoShadowCast
AdBoard
SidelineProps
SouthZone_NoShadowCast
MainStadium_ShadowAlpha
NorthZone_ShadowAlpha
Alpha2_ShadowAlpha
Jumbotron
Alpha_ShadowAlpha
MainStadium_NoShadowCast
EnvironmentSkirt_NoShadowCast
if you install a fifa12 stadium in fifa13 the new external files are not calling. And your stadium look bad! You must reimport your parts in a fifa13 container, I'm sorry