Hole in A320 !

[A9C-MS]

Hi
I hit a problem while I'm repainting SATA International A320 (original paint kit), I noticed a hole on top of the fuselage as you can see from the picture (almost done).

I thought it was an antenna (may be Sat-com) but had no luck finding it, so can anybody help me?

[GaryG]

You must be the lucky winner being the 100th one asking this

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[A9C-MS]

Thanks a lot, I must be new to the board!!