Hi Yann,
The ODBC Properties looks OK.
The DSN has * for the Table Selection, please change to AP81B* to minimize the tables returned to MSAccess

In an earlier screen shot of the Visual Connection Expert you show Red&Yellow pointer for the 3 keys from APTransactions_ap81btrn.
It is my understanding that these only were displayed for ODBC 8.5 and are not there ( at this time ) in ODBC 9.1