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Get the book, "Subfile Technique for RPG/400 Programmers 2nd Edition" By Jonathan Yergin and Wayne Madden. From DUKE Press (www.news400.com). It has source examples of order entry subfiles. It's a good book, I used it to learn more of the other subfile techniques.

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Michael Catalani's "Subfiles for RPG Programmers" from Midrange Computing is decent. He takes you from basic to complex subfile design in a nice, progressive manner. Lots of detailed RPG III code and display file examples. A glaring omission is a lack of information about coding subfiles to allow option selection on a subfile line item, except by using cursor position. He promises he will cover doing this by option number 'later', but never does unless I've missed something. And sometimes new keywords and concepts appear in the examples without any explanation in the text. But overall, it is a useful book. Also, Pence & Hawkins' "Power RPG III" and "Power RPG IV" books (also MC) have brief, but informative sections on subfiles, again with examples. They do explain one technique for performing option selection on a subfile by option number.

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Yes, i would think so. When ready, chain to the file with an indicator in 54-55. If the indicator is on, write the record. if the indicator is off, update it.

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I think I know what you're asking for. We have many screens like this, including PO entery and Order Entry. Let me see if I have this straight.. here's an example of what I think you want. Purchase Order Entry Vender: _________ PO#:____________ any other header data (leave this area blank to update selected detail lines one at a time) Select options, press Enter. 2=Change 4=Delete Opt PO Line Purchase# Qty Cost Ext. Cost _ 1 Item1 1 2.45 2.45 _ 2 Item2 3 4.23 12.69 _ 3 Item3 2 1.00 2.00 .... ... ... F3=Exit F6=Add F12=Cancel message line ------------------------------------------------ So, this will not only display what is on the PO, but will also allow update of the PO lines. Use the option field to select lines to update, and display the PO line data in the area noted above (This is because there will most likely be more info that can be updated on the subfile line itself, also makes it a little easier). When enter is hit, update the PO detail file. When all lines that were selected have been updated, reload the subfile do display new changes in the subfile. I made this display with IBM standards to make it easier to understand. F6 will display blank data in the detail line screen area with an incremented detail line number. Simple enuff.... Did this help at all?

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