BPC Consolidation 7.5 NW- Different currency conversion for P&L

Hi Gurus,

     We have a new consolidation requirement to implement in BPC 7.5 NW. We have several company codes in different currencies which groups consolidate in EUR.  We have customized currency conversion process in BPC with different currencies: LC, reporting, transactional and Group and we have defined different rates.

     We have created a conversion rule associated to rate type used: END (rate type at the end of the period).

     But now, we need P&L accounts have a different conversion. In this case the rate type shouldn’t be fixed during the period; the value of these accounts in EUR should be the same that value in currency group in SAP R3, which it is calculated when the document is posted using  rate type valid in that moment. For example:

C_Account 3100000:

• 2013.03.01   Doc 1: 1000 USD = 500 EUR  rate type:0,50
• 2013.03.15   Doc 2:  1000 USD = 520 EUR rate type 0,52
• 2013.03.31   Doc 3:   1000 USD = 600 EUR rate type 0,60

     With rate type END we have: LC = 3000 USD = 1800 EUR (rate type 0,60). But we need value for these c_account will be: 1620 EUR (500+520+600).

     We think this is the usual way to consolidate P&L but we don’t know how to implement it in BPC.

Thanks in advance.

Best Regards.