Line Chart Design: Can't show a calculated variable like a entire in of a dimention

Hi everybody

I have a little problem on SAP BO 4.0.

I want to display the next crosstab like line chart :

But the column "Total", is a calculated field, the rest is a "Zona SM" dimention, i can to do the next line chart

with the next Assing Data:

But when i want show the field "Total:", the formula is applied to each value of the "Zona SM" dimension as follows:

then we have the next chart:

That isn't correct because i want show as follows:

Thanks a lot for any suggestion

Kind Regards