quotation with target value (field ZWERT)

Hello

the requirement is to create a sd quotation, which is not based on target qty or order qty!! furthermore I need to have a sd quotation which is based on target value. Is there any way to have this? I tried all the standard quotation types (AG, AV, AS, ...)! All of them are qty based not value based! What can I change in customizing to have it value based? could it be solved by change the field "Screen sequence grp." from AG to WK1 without change any logic for standard quotation reports??

please help...

thx

deniz