Pass parameter from SSAS to Non-SSAS based report

Hi,

I want to pass a report from my mainreport based on a SSAS cube to my subreport which is a NON-ssas cube (relationel datasource)

How can achieve this when my parameter is structured like this in SSAS:

I tried using Projectid.UniqueName - but this is passing the whole string [ProjID].[ProjID].&[be]&[PRJ180127-00001]  - which my other report wont accept as a parameter.