How can you change text varaible for offset fiscal year

Hello all,

I am using variable for fiscal year (0P_GJAHR) and then I am using text varaible (&0T_FYEAR&) so that the fiscal year comes up in the key figure column.

Now I am offsetting the fical year variable by -1 so that I can get comaprison between current year and previous year but the text varaible still shows the current year, how do you offset the text varaible by -1 ?

Thanks in advance