PJR,
this also doesn't make sense:
%VALUE%*([ACCOUNT].[SALES_QTY],[TIME].[2016.01],[CATEGORY].[Plan],[AUDITTRAIL].[Input],[ARTICLE].[A_NONE],[ARTICLE_COLOR].[ART_NONE],[PLANT].[1002]))/%VALUE%
this expression is (value*number)/value= number ... no need for multiplication and then division
You also have an extra parenthesis after your tuple member [ACCOUNT].[SALES_QTY],[TIME].[2016.01],[CATEGORY].[Plan],[AUDITTRAIL].[Input],[ARTICLE].[A_NONE],[ARTICLE_COLOR].[ART_NONE],[PLANT].[1002])
Akos