Issue with Method-Based Multipliers

Hi Experts,

I am trying to Create Method-based multipliers based on the info available in the Below link:

http://help.sap.com/saphelp_bpc10_nw/helpdata/en/72/b83906b23e448886f1b604944d4a48/content.htm?frameset=/en/a1/532226947c49a5b2e2bd32450cb2d1/frameset.htm&current_toc=/en/82/f51cf12cfc48c58975b9b5e6fba9aa/plain.htm&node_id=176

I have some queries as listed below:

1) Do the system automatically generate values like [PPOWN] - Prior % of ownership, [I_POWN] - % of Ownership of Interco Member, [I_PPOWN] - Prior % of Ownership of Interco Member etc? Do we have to Manually provide these %'s through Ownership Manager?

2) Do I need to have theses members in my Account Dimesion for Ownership Model? If yes ,then do these Members need to have the Value 'Y' against property "IS_INPUT"?

3) I was initially using Member 'I_POWN' in a particular Method based multiplier and was getting the error  "Formula ‘I_POWN’ is not supported".  Subsequently when I Replaced it with "[I_POWN]" I did not get the same error but when I used the Expression "1-[I_POWN]" again I got an error -

Formula ‘1-[I_POWN]’ is not supported'. I also tried the expression "(1-[I_POWN])" and got a similar error -"Formula ‘(1-[I_POWN])’ is not supported."

Am I missing Something? I am having no issue using O_Account Members POWN, PCON, PCTRL which are part of my Account dimension for Ownership Model with "IS_INPUT" property value as "Y".

Warm Regards,

Collin.