Problem between SSMS and Report ! Filter query not showing data or showing wrong data

Question

Hi all,
In short: I have a report with multiple values such as name of shop, postal code etc. The parameters have no default value and act as "like". If someone enters "krant" he'll get all the shop names that contain "krant" in their
name etc. 
Same goes for postal code, if someone enters 2550 he'll get all data for 2550. The problem although is that if a user start with postal code as parameters and leaves the shop name empty, the shop name is not shown in my report! The other way around it works,
when I enter shop name i'll get all shops + postal code in my report.
I know this is because POS name cannot be shown in report because it's left blank, but I want my MDX query to be able to give me the POS names even if I only enter postal code.
Can someone please please look at my query below? I need to add 4 more parameters this way later on too!
SELECT 
[Measures].[Sales amount]
 ON COLUMNS, NON EMPTY
Filter(
                               [Point of sale].[POS name].AllMembers,
                               InStr(
                                               [Point of sale].[POS name].CurrentMember.MEMBER_CAPTION,
                                               @PAR_POSName
                               ) > 0
*Filter(
                               [Point of sale].[POS postal code].AllMembers,
                               InStr(
                                               [Point of sale].[POS postal code].CurrentMember.MEMBER_CAPTION,
                                              @PAR_POSTAL_CODE
                               ) > 0
*[Point of sale].[Client id].[Client id]
*[Point of sale].[POS id].[POS id]
*[Point of sale].[POS street].[POS street]
*[Point of sale].[POS town].[POS town]
*[Point of sale].[POS housenumber].[POS housenumber]
ON ROWS
FROM [mycube]

Answer 1

You have to use
StrToMember (MDX) /
StrToSet (MDX) /
StrToTuple (MDX) to convert the Parameter; see
Parameterized Reporting Services Reports with Analysis Services as a Data Source
Olaf Helper
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