The usual CVD restrictions that I currently have on my JAR Class 1 medical are not permitted on the EASA Class 1 Medical.
Your friend should check this out, because there is little point in him doing the CPL flight test - he will not be given an EASA CPL.
From the Part MED AMC:-
EASA - European Aviation Safety Agency
VCL Valid by day only
The limitation allows private pilots with varying degrees of colour deficiency to exercise the privileges of their licence by daytime only. Applicable to class 2 medical certificates only.