BI Publisher - MAX function broken ?

 I am using BI publisher 11.1.1.6

I have the following table with two records :

SELECT * FROM MMJ2;

F1       F2

---      ----

-10    100

-5       200

I create a dataset G_1  doing a select * from mmj2

I drag F1 from G_1 to the Global  Level Functions dataset and do the MAX aggregate function. F1 and F2 are number fields in the db and integers in BI Publisher.

It is returning 0 as the max for F1, it should return -5.    Here is the sample XML output :

<DATA_DS>

<G_1>

<F1>-10</F1>

<F2>100</F2>

</G_1>

<G_1>

<F1>-5</F1>

<F2>200</F2>

</G_1>

<MAX_FI>0</MAX_FI>

</DATA_DS>