in ObjectContext.m,
method -(NSString )prepareQuery:(NSString)aFunctionName parameters:(NSDictionary*)aParam
 
 
You have both
else if([obj isKindOfClass:[NSDecimalNumber class]])

                anUrl=[anUrl stringByAppendingFormat:@"?%@=%@f",key,obj];

 
and
 
else if([obj isKindOfClass:[NSDecimalNumber class]])

                    anUrl=[anUrl stringByAppendingFormat:@"&%@=%@f",key,obj];

 
 
where those "f" literals should be M?