Hello All,
I have a Scenerio for Header Discount Condition Enhancement as Follows:
Discount Conditions Used: ZDHA (Amount Disc), ZDHP (Percentage Disc)
Items in Sales Order having item Categories: ZTAO (Fixed Price Items - Milestone Billing)
ZTD1 (T&M Items - Variable Price Items)
Basic Condition Value (EK02) of Items is getting Fetched from Project - Quotation - RRB Sales Order
1. Header Discount Condition given at Header shall only be Applicable for ZTAO type Items and Discount shall be made 0 for ZTD1 items.
2. Discount (ZDHA/ZDHP) on Item Level shall get Proportionately Distributed to ZTAO items as per their Basic Condition Value of EK02 and item qty.
3. If Discount Amount Exceeds the Total Condition value of EK02 then system should give a Pop Up Of Error Message saying Cumulative Value of Discount cannot exceed Total Condition Value of Basic price of Items (EK02).
4. If any of the items in Sales order is Billed and in future if the User inserts new item in the same order if type ZTAO then the discount available at Header shall get Proportionately Distributed to the New Line Item.
Please provide your views on above Enhancement to be carried out. The User Exit and Function Module at VA01 and VA02 in which this enhancement can be made.
And Formulla for manipulating the proportionate value od Discount at Item Level.
Please Note this is a PS - SD integration Process carried out using Resource Related Billing (RRB) hence generating RRB Order with EK02 Condition.
Looking forward to your valuable views as this is a bit of Complex Enhancement 
Warm Regards,
Onkar Khedekar