Hi Sophie,
Behind both Key Figures 0LATITUDE and 0LONGITUDE is ABAP Data Dictionary Domain RSKYFGIS. This Domain has 12 decimal places.
I checked and indeed in the Key Figure maintenance on tab Addtional Properties you cannot define more than 9 decimal places. The same will be the case in the BEx Query.
I suggest to leave the no. of decimal places "undefined' in both Key Figure and BEx Query. Can you please do that and check the result?
Thanks,
Sander