Free-format program calls

Hello all,

I know this is probably more appropriate for the RPG list but I'm not subscribed to that one at the moment. I'm working on putting a call to an external program inside a completely free-format RPG program. The program has more than 10 parameters. We are on version 7.3. I'm trying to understand whether both the DCL-PR and DCL-PI are needed. I'm thinking that the PI is not needed. When I do my call to my external program, do I reference the parameters in the "PR" section or do I have to create another set of variables? I've done some looking online and it's hard to determine what all is necessary. Any info would be most appreciated. Thanks!

dcl-pr lb002 extpgm;

serial packed(11);
format char(3);
partnumber char(20);
lotnumber char(15);
quantity packed(15:5);
unit char(3);
source char(3);
multiples packed(3);
ordernumber packed(9);
orderitem packed(3);
orderrelease char(8);
bolnumber packed(9);
bolitem packed(3);
reference char(20);
print char(1);
outq char(10);
mst# packed(11);
kanb char(15);
ran# char(20);
workorder char(10);
pcksz packed(15:5);
mode char(1);
status char(1);
wipseq packed(3);
labelcount packed(5);
futfield char(100);
pcntr char(3);
pcnbr packed(10);

end-pr;


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