invalid column name ....

[Raquel]

This simple piece of code in a try-catch block in SQLJ stored
procedure is failing with CLI0611E - invalid column name:
#sql [ctx] sproc3_iterator = {SELECT FIRSTNME, LASTNAME FROM
DB2ADMIN.EMPLOYEE WHERE WORKDEPT = :workdept};
rs1[0] = sproc3_iterator.getResultSet();
ctx.close();

I have (re)checked that FIRSTNME nad LATNAME are valid columns of the
table (in fact the above query runs fine, if executed independently
outside the stored procedure).

TIA
Raquel.