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1. ODAC 6.50.0.35

2. OraSQL:
begin
:b := true;
end;
b: Data Type = boolean, Param Type = out

3. Execute

4. Error:
ORA-06550: line 2, column 9:
PLS-00382: expressin is of wrong type
ORA-06550: line 2, column 3:
PL/SQL: Statement ignored

Boolean data type can be used inside PL/SQL only. So ODAC maps ftBoolean parameters to Oracle INTEGER type. The error occurs because you cannot assing True to an INTEGER variable.