You only need seperate IRI and CRI certificates if you are not an FI. It seems some countries don't seem to understand this.
There is an EASA drafting error in Part-FCL which means that a CRE must hold a CRI certificate, and a IRE must hold a IRI certificate regardless of their FI privileges. This is (hopefully) being corrected by NPA 2014-29(A) which will allow a FI with the relevant privileges to hold the associated examiner certificate. (See FCL.1010.CRE and FCL.1010.IRE)
ifitaint...