If metadata security is established, when you create Web Analysis documents against an Essbase cube, adhere to this guideline:
If report member selections contain dimensions that are specified in a METAREAD filter, use dynamic member selections (for example, Children of East) and use only members that users can access. Users accessing a Web Analysis document that contains members that they cannot access receive an Unknown Member error.
For example, If a METAREAD filter applies to the Market dimension and @Children(East) is specified, when users try to open the Web Analysis document with the METAREAD filter, Unknown Member is displayed, because the users cannot access West, South, and Central.