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Well, it looks like I can read, chain, and update an externally described file from a LIKEREC DS just fine. But apparently WRITEing from a DS isn't allowed? I get RNF7701 - The data structure is not allowed for the operation, during the compile. I tried by declaring the file for update mode, with addtions allowed: FDFamly UF A E K Disk ExtFile('DMART/DFAMLY') And also tried by declaring it for output: FDFamlyWrt O E Disk ExtFile('DMART/DFAMLY') F Rename(RFAMLY:RFAMLYW) Why would the compiler let you read, chain and update, but not write from a DS? Is this a known, undocumented limitation? -- "Enter any 11-digit prime number to continue..."
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