Precompiler doesn't like the LIKE

I have the following subprocedure, at OS level V6.1. The precompiler
chokes, saying that 'Rtn' is not defined, or not usable. RPGLE seems to
have no trouble, as I've defined return values like this before, just never
a variable used as a host variable in an SQL statement. Is this just a
Pre-Compiler shortfall, or is there something I'm doing incorrectly?



D $GetLblMod PR LIKE(SFCLB2Ctmp.LBL)
D InCust LIKE(ECLtmp.LCUST) CONST
D InShip LIKE(ECLtmp.LSHIP) CONST
D OPTIONS(*NOPASS)
....
....
....
P $GetLblMod B
D $GetLblMod PI LIKE(SFCLB2Ctmp.LBL)
D InCust LIKE(ECLtmp.LCUST) CONST
D InShip LIKE(ECLtmp.LSHIP) CONST
D OPTIONS(*NOPASS)
D*-------------------
D Rtn S like($GetLblMod)
D Ship S like(ECLtmp.LSHIP)

/FREE

if %parms>=2;
Ship=InShip;
endif;

exec sql
select LBL into :Rtn
from SFCLB2C
where ID='ID'
and Cust=:InCust
and (Ship=:Ship or Ship=0)
order by Ship desc
fetch first row only;

RETURN Rtn;

/END-FREE
P $GetLblMod E