Notes from a developer who writes ABAP on real SAP systems and hands that work to agents. Art, travel, the economy and books live next door.
FRI 10.09
2026.10.09 Korea time
'26/10/08 UPDATE
Korea’s foreign exchange reserves fell $1.72 billion in September, but dollar sales are not among the reasons the Bank of Korea gave. This note separates deposits, currency conversion and rounding, and shows where actual net dollar sales are published three months later.
'26/10/08 UPDATE
ABAP fixes the calculation type first, including the result field, and integer arithmetic rounds after every division instead of truncating. Using a fictional example, this note covers why 7 / 2 gives 4 and 7 / 2 * 2 gives 8, when an inline declaration drops decimal places, and how to use DIV and MOD when you need truncation.
'26/10/07 UPDATE
The server sent 9007199254740993, but res.json() gave 9007199254740992, because a JavaScript number cannot hold integers above 2^53-1 exactly. Using a fake order API on 127.0.0.1, this note reproduces a cancel request hitting the wrong order, then shows two fixes run with Node.js v24.21.0: sending IDs as strings, and keeping the original digits with JSON.parse's context.source and JSON.rawJSON.
'26/10/07 UPDATE
AT NEW kunnr treats kunnr and every column to its left as the group key, and when you read with INTO, the columns right of the key turn into asterisks and initial values inside the AT block. With four fictional sales rows, this note covers the causes, three fixes (column order, copying values, GROUP BY), WHERE conditions and how the documentation editions differ.
'26/10/06 UPDATE
A reading guide to volume 7 of Minumsa's World Literature series, Joseph Conrad's Heart of Darkness: Lee Sang-ok's translation, the frame that opens on the Thames, the course of the three parts, the lie told at the end by a narrator who says he cannot bear one, the argument around Achebe's critique, and what to mark as you read.
Just arrived
ABAP fixes the calculation type first, including the result field, and integer arithmetic rounds after every division instead of truncating. Using a fictional example, this note covers why 7 / 2 gives 4 and 7 / 2 * 2 gives 8, when an inline declaration drops decimal places, and how to use DIV and MOD when you need truncation.
Korea’s foreign exchange reserves fell $1.72 billion in September, but dollar sales are not among the reasons the Bank of Korea gave. This note separates deposits, currency conversion and rounding, and shows where actual net dollar sales are published three months later.
AT NEW kunnr treats kunnr and every column to its left as the group key, and when you read with INTO, the columns right of the key turn into asterisks and initial values inside the AT block. With four fictional sales rows, this note covers the causes, three fixes (column order, copying values, GROUP BY), WHERE conditions and how the documentation editions differ.
The server sent 9007199254740993, but res.json() gave 9007199254740992, because a JavaScript number cannot hold integers above 2^53-1 exactly. Using a fake order API on 127.0.0.1, this note reproduces a cancel request hitting the wrong order, then shows two fixes run with Node.js v24.21.0: sending IDs as strings, and keeping the original digits with JSON.parse's context.source and JSON.rawJSON.
Korea's August industrial activity data showed output, retail sales and investment all down, yet the coincident index's cyclical component rose 0.5 points to 101.7. Trace the gap through the seven components and their volatility, and see why 0.6% and 0.5 points differ.
A reading guide to volume 7 of Minumsa's World Literature series, Joseph Conrad's Heart of Darkness: Lee Sang-ok's translation, the frame that opens on the Thames, the course of the three parts, the lie told at the end by a narrator who says he cannot bear one, the argument around Achebe's critique, and what to mark as you read.
npm's ^ holds the left-most non-zero digit, not "the same major", so ^0.2.3 never takes 0.3.0. Using real installs with npm 11.19.0 against a fake local registry, this note shows what each range brings in, what the lockfile, npm outdated and npm update each change, and how to move a 0.x dependency to its next minor.
Why does a held document have no number, and why can’t a colleague find it? A fictional example shows what Hold and Park each leave behind, what happens to the number on posting or deletion, and what changes in S/4HANA.
Four works by Vincent van Gogh from 1887 to 1889, a self-portrait, a drawing, a wheat field and cypresses, set in order to follow which way the strokes lie and where their kind changes.
An order number shown as 123 on the screen is stored as 0000000123. This note explains when the ALPHA conversion routine runs automatically and when it does not, when code must convert with ALPHA = IN, and which values get no zeros, using fictional examples.
Korea's consumer prices rose 0.3% during September, yet the year-on-year rate fell from 3.1% to 2.9%. Rebuild 2.9% from four published index values and see how last September, and last August's phone bills, moved this year's rate.
A reading guide to volume 6 of Minumsa's World Literature series, Mark Twain's Adventures of Huckleberry Finn: the text Kim Wook-dong's translation is based on, the novel's four settings, the scenes in Chapters 15, 16 and 31 that build to Huck's decision, the argument over the last twelve chapters, and what to mark as you read.