Profile variable '&1' has illegal value '&2'.

What causes this issue?

There is a profile variable with the name "<EX>abap/unicode_check</>",
which is important for the question, wether all ABAP sources are
required to fullfill the ABAP 6.10 Unicode enablement requirements.
The value of this profile parameter has to be "<EX>off</>" or "<EX>on
</>".

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Use report <DS:REPN.RSPFPAR>program RSPFPAR</> to check the value of
the parameter. Use transaction <DS:TRAN.RZ10>RZ10 (profile
maintainance)</> to correct the value if neccesary. If you modify a
profile, the application server has to be restarted after that.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.