GETPIVOT and OLAP - relative references

I have been using GETPIVOT with Non Olap cubes for years and loved the formulas as it provides great flexibility when changing to relative references. Now I am at a new company and they are using Olap instead and now I cannot get the GetPivot formula (2010) to accept relative references. Specifically - =GETPIVOTDATA("[Measures].[FirstReg-RMA Product Count]",$A$8,"[Date].[Calendar]","[Date].[Calendar].[Calendar Year].&[2008]","[Date].[week_of_year]","[Date].[week_of_year].&[4]") - I am trying to change the last part of the formulas ].&[4]") and make the 4 a relative references but nothing really works. Any help appreciated. Niklas