Replace nulls with previous not null value in SSAS

Hi Team,

I have a requirement to replace nulls with previous not null value for trending purposes.

Requirement is something similar to http://social.msdn.microsoft.com/Forums/sqlserver/en-US/a80987fa-4e91-47a1-93c3-fdee9b835c8c/replacing-null-values . But I need it as MDX expression in SSAS cube

I have some 10 calculated measures which are part of this requirement.

I tried to fix this issue with

new measure  [Measures].[Yeild_nw]

(TAIL(
NONEMPTY({NULL:[Date].[Date].CURRENTMEMBER} * [Measures].[Yield])
).ITEM(0))

I am not able to achieve it. Please help.

Thanks and Regards

Vijaya