ERROR with "Update ... where Current of"

Hi,

after a lot of studying i couldn't find out what's going wrong with my
positioned update. Whatever i have tried: SQLGetDiagRec reports: Error:
"Cursor C1 does not exists"

Here is my Code (a simplified example from MS):
...
SQLRETURN = SQLAllocHandle(SQL_HANDLE_STMT, hdbc, &hstmtSelect);
SQLRETURN = SQLAllocHandle(SQL_HANDLE_STMT, hdbc, &hstmtUpdate);
SQLRETURN = SQLSetCursorName(hstmtSelect, "C1", SQL_NTS);

SQLRETURN = SQLExecDirect(hstmtSelect,
"SELECT NAME, PHONE FROM CUSTOMERS",SQL_NTS);
/* in the example, a SQLBindCol followed here ... */
SQLRETURN = SQLFetch(hstmtSelect);
/* positioned update : set first customers phonenumber to empty */
SQLRETURN = SQLExecDirect(hstmtUpdate,
"UPDATE EMPLOYEE SET PHONE=\"\" WHERE CURRENT OF C1",SQL_NTS);

...SQLRETURN is set to -1, SQLGetDiagRec reports Error: "Cursor >>C1<< does
not exist"
...
psqlodbc30a.dll ist directly linked.

Here is what i have tried:
- Reading, exploring, reading, ...
- Select ... for Update
- connection Parameter UpdatableCursors=1;
- connection Parameter Autocommit off
- connection Parameter UseDeclareFetch=1
- Select ... for Update
- Select ... with hold
- older odbc Driver 8.04
- explict BEGIN

Any help would be greatly appreciated!

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