Hi Jakob,
Have you tried to perform a select on any table, eg: "YIT_SAP" to confirm it's existence ?
eg: SELECT T0002."LANGU", T0001."SCOMP2", T0001."POSIT2", T0001."SCOMP", T0002."KTEXT" FROM "YIT_SAP" T0001, "YIT_SAPT" T0002 WHERE T0001."SCOMP" = T0002."SCOMP" AND T0001."POSIT" = 0 AND T0001."POSIT2" <> 0)
For the same table, check your import logs to reconfirm a successful creation and load.
Cheers,
Amerjit