problem using flag values after calling the RFC

hi

i have called about 5 RFC on the single model ,

and these RFC's are called at different stages ,

in one of the RFC called Z_RFC_SM i have Structure

called It_Calc which has some elements and flag elements

(ex:make,model,car,flagmake,flagmodel,flagcar)

and flag elements datatype in the backend is Char

but after i have called the RFC , there flagvalues are

of type boolean

problem is i have to compare this flagvalues with Char values

X , so that i can chnage the color .

can any one help me ?