BPC 10 NW Member formula using property value

Hello Experts,

I have a member formula requirement that should divide the account SALES_TOT with the number of days in that month

[SALES_TOT]/[TIME].CURRENTMEMBER.PROPERTIES("BASE_PERIOD") works but it wont suffice my requirement.So when I add a new property to time NUMBER_OF_DAYS and use this property, it gives an exception

[SALES_TOT]/[TIME].CURRENTMEMBER.PROPERTIES("NUMBER_OF_DAYS") gives an exception

I understand from other sdn posts that property values are stored as characters and we cant use it directly.

But then how [SALES_TOT]/[TIME].CURRENTMEMBER.PROPERTIES("BASE_PERIOD") works and my new property doesnt work.I tried by giving three characters value to NUMBER_OF_DAYS like BASE_PERIOD but still it fails.

I am on BPC 10.1 NW system on HANA

Thanks,

Senoy