Internal failure occurrs on SETLL statement

I'm hoping someone has come across this.

I have started using /free format and I keep getting an Internal Failure -1
error on a SETLL statement when I compile this program. The curious part is
that if I only use 1 key field it
will compile fine, the  problem is when I use both keys on the SETLL.

Here is some of the relevant code.

 fsocrh       if   e           k disk
 fsocrhx1   if   e           k disk    rename(socrhr : socrhx1r)
 fsocrhx2   if   e           k disk    rename(socrhr : socrhx2r)
  *---------------------------------------------------------------
 d Socrhx2Keys     ds                  LikeRec(socrhx2r : *key)
  *---------------------------------------------------------------


setll     %kds(Socrhx2Keys) socrhx2r;     <===== Internal Error on this
statement.


I have also tried the following with the same results (internal error)

 setll     (S18BCusN : s18Quot#) socrhx2r;  <=====Internal Error here as

well.

On the other hand this compiles and runs fine.

setll S18BCusN socrhx2r;                            <===== This will compile
fine.


Socrhx2r is the record format for Logical file Socrhx2. The key fields for
this file are S18BCUSN and S18QUOT# (they are NOT unique).
We are running at V5R2.


Does anybody have any ideas?

TIA
Mauricio Della-Quercia