ODBC/Access with boolean-column in where-clause

the problem is when i create a query with a boolean column in the
where-clause something (access? or the odbc-driver?) converts the "true" into 1 
and the
database can't compare boolean with 1. How can i solve this problem? Is it
possible to handle this in the odbc-driver? Otherwise is it possible to learn
sapdb to compare boolean to integer? Or can i change any settings in access,
the odbc-driver or sapdb?

the sqltrace looks like this:

S3:SELECT "DBA_ARTIKEL"."ID" FROM "DBA"."ARTIKEL" "DBA_ARTIKEL" WHERE 
("VORMERKEN" = 1 )
PARSE  : CMD   :  
SQLCODE:  -8006      Data types must be compatible
PARSEID: OUTPUT:  00000000 00000000 00000000 00000000
SQLERRD(INDEX_6) : 83         ERROR NEAR ^ : MERKEN" = ^1 ) 
START  :  DATE :  2002-09-30    TIME :  0022:34:08
END    :  DATE :  2002-09-30    TIME :  0022:34:08

S3: DISCONNECT 

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