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I never knew that so had to look it up, thanks Jon.
https://www.ibm.com/support/knowledgecenter/en/ssw_ibm_i_73/rzasd/freedatastructure.htm
3. A data structure using DCL-SUBF to define some of its subfields.
Subfield select has the same name as an operation code allowed in
free-form calculations. DCL-SUBF is required for this subfield. See Table
1.
Subfield name does not have the same name as an operation code, so
DCL-SUBF is not required.
Subfield address does not have the same name as an operation code, so
DCL-SUBF is not required, but it is valid.
DCL-DS *N;
DCL-SUBF select CHAR(10);
name CHAR(10);
DCL-SUBF address CHAR(25);
END-DS;
You don't have to change the names to avoid "reserved" names in
free-form.
On data declarations in DS for example you simply add dcl-subj in front
of the name.
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