Add "%" sign with value in Adobe form field

Dear Fellas,

I want to add the "%" sign with the condition amount in adobe form. Also, I concatenated the % sign but unable to display it on the form layout. Images are attached.

DATA : LV_GST_PER TYPE prcd_elements-KBETR.

SELECT SINGLE kbetr FROM prcd_elements INTO (ls_data-LV_GST_PER)
WHERE knumv EQ lv_doc_con AND kschl EQ 'MWST' AND kposn EQ ls_vbrp-posnr.
move ls_data-LV_GST_PER to ls_data-percent.
CONCATENATE ls_data-percent '%' INTO ls_data-percent.