SRM FPM Webdynpro Purchase Order Component Enhancments

Hey ,

I would like to seek help for the Purchase order Item level component /SAPSRM/WDC_UI_PO_DOTC_IT

VIew -V_PO_DOTC_BASIC

The Standard drop down by key ITEM_TYPE at Item table control has to be controlled in such a way that it gives only

MATERIAL ,LIMIT as values instead of standard MATERIAL,LIMIT and SERVICE

Thanks  in advance!!