Color bar in SAPScript

Hi all,

currently, I'm trying to print a colored bar on a SAPScript form, which has to have a dynamical length.

My idea was to upload a small colored square as an image and then print it x times next to each other.

Therefore, in the print program, I loop over the element like this

DO xTIMES.
       gv_xpos = sy-index.
       CALL FUNCTION 'WRITE_FORM'
           EXPORTING
             element                  = 'PRINT_BAR'
             function                 = 'APPEND'
             window                   = 'BAR_UP'
          ....
ENDDO.

And in the form, I print the element with the XPOS value incremented in the print-program like this:

/E         PRINT_BAR

/:         BITMAP 'GREEN_40_PX' OBJECT GRAPHICS ID BMAP TYPE BCOL XPOS &GV_XPOS& CM

However, on the form, the boxes are not being printed next to each other.

Any ideas, what I'm missing?

I've already fiddled with the "function"-parameter of the WRITE_FORM and I tried setting the window position as well, but without any luck so far.

I've declared gv_xpos as integer and as character, but it didn't make any difference.

Thanks and regards

Matthias