Perl SAP::Rfc - input tables - The specified type Typ rfcdes is unknown.

I am pretty new to SAP and am working to understand the guts of it while also trying to do something useful, especially understanding how we could use Perl Sap::RFC. I've been looking for days and making a little progress over time, but now I'm stuck.
Problem Summary:
I want to read the RFCDES table using RFC_READ_TABLE to get a dump of what's in there. It is apparently too large for a plain RFC_READ_TABLE, but I discovered that by defining the fields that I want, I can get out what I need. I did this by successfully executing RFC_READ_TABLE in SE37 for the RFCDES table by defining entries in the FIELDS table, but I can't figure out the right way to send a table as input to SAP via SAP::Rfc.
Background:
I am using SAP::Rfc v 1.55 on linux with 640,0,303 release of the rfcsdk.
I am getting the error:
RFC call failed: EXCEPT SYSTEM_FAILURE GROUP 104 KEY RFC_ERROR_SYSTEM_FAILURE MESSAGE The specified type Typ rfcdes is unknown. at /home/<userid>/local/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi/SAP/Rfc.pm line 1055.
Here is my code block (minus connect info):
my $it = $rfc->discover("RFC_READ_TABLE");
$it->QUERY_TABLE("rfcdes");
$it->ROWCOUNT( 30 );
$it->OPTIONS( ["NAME LIKE 'SAP%'"] );
my $str = $it->tab('FIELDS')->structure; # I think this line is extraneous
$it->FIELDS([{ FIELDNAME => "RFCDEST", OFFSET=> "000000", LENGTH => "000000", FIELDTEXT=> ""}]);
$rfc->callrfc( $it );
$rfc->close();
The parameters to FIELDS are what worked in SE37. I would eventually like to return more than just rfcdest (such as RFCOPTIONS) but at this point, anything working would be good
I have successfully done an RFC_READ_TABLE with SAP::Rfc (using the tables.pl example) so I'm pretty sure I have that working but I think the FIELDS input/output table is throwing me off. Maybe I'm not understanding the array of hashes correctly?
I have looked at the thread SAP-::Rfc with Perl which got me this far but I'm still missing something. Can anyone please help?
Thank you for your time.

You might want to check out the newer SAPNW::Rfc. Not sure what version system you're connecting to.
Anyway, here's how I did RFC_READ_TABLE with SAP::Rfc years ago:
my $IT = $RFC->discover("RFC_READ_TABLE");
$IT->QUERY_TABLE('TBTCO');
$IT->OPTIONS( ["ENDDATE = '$MAXDATE' AND ENDTIME > '$MAXTIME' OR ENDDATE > '$MAXDATE'"] );
my @FLDARRAY = qw(JOBNAME JOBCOUNT JOBCLASS PERIODIC REAXSERVER RELUNAME SDLUNAME
AUTHCKMAN EVENTID SDLSTRTDT SDLSTRTTM STRTDATE STRTTIME ENDDATE ENDTIME STATUS);
$IT->FIELDS([@FLDARRAY]);
$RFC->callrfc( $IT );
print "Num Rows in PRD matching selection criteria: ".$IT->tab('DATA')->rowCount()." \n";
for my $ROW ( $IT->DATA ) {
#do stuff;
$RFC->close();
Cheers,
David.
For reference, here's my wiki profile, where you can find my blogs on SAPNW::Rfc, and some sample scripts.
http://wiki.sdn.sap.com/wiki/display/profile/David+Hull
Edited by: David Hull on Mar 28, 2010 10:05 AM

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