Sales order: How to add pricing conditions at item level in BDC of VA01

Hello Experts,

Am writing BDC for sales order, in this process I need to add ITEM PRICING CONDITIONS, so, am selecting item and pressing the DOLLAR symbol button and am adding the conditions by pressing PLUS button in loop!! but am getting this erorr- Field KOMV-KMEIN (2) is not an input field!! when I execute it in we19-BACK GROUND only!! if I execute the same CODE IN we19-Fore ground, I dont have any issue!! I checked this SDN (field status in config), Google, but did not helped me!

Pls. let me know is there any other way to add conditions at item level in VA01 in BDC code?

THank you