Default the Line from the Item Card

Default the Line from the Item Card

Your warehouse assigns every item a quality grade, and sales wants that grade stamped on each order line automatically — no retyping, no lookups. In Business Central this is a classic pairing: two table extensions carry the field, and an event subscriber copies it the moment an item lands on a line.

Requirements

1. Create a table extension that extends the Item table and adds a field named "Quality Grade" of type Code[10].
2. Create a table extension that extends the "Sales Line" table and adds a field named "Quality Grade" of type Code[10].
3. Create a codeunit with an event subscriber to the "Sales Line" table's OnAfterAssignItemValues integration event, so that validating "No." on an item line copies the item's "Quality Grade" onto the line.

The copy is unconditional — the line always mirrors the item that is on it:

• An item with a blank grade produces a line with a blank grade.
• Re-validating "No." to a different item replaces the line's grade with the new item's grade.
• Re-validating "No." to an item without a grade leaves the line's grade blank.

The subscriber must fire during ordinary validation, without anyone binding or calling your codeunit first.

Pick object and field IDs in the range 50100–50199, and reference other objects by name, never by ID. Captions are good practice but not graded.

What the tests check

The grading tests create items and sales orders with the standard libraries: an item with a generated grade lands that grade on a new order line (so a hardcoded value fails); a grade-less item leaves the line blank; re-validating "No." to a second item overwrites the grade, and to a grade-less item clears it; the tests reach both fields by name at run time (a missing or misspelled field fails with a message saying so), and finally both fields must be declared as type Code with a maximum length of exactly 10 — a Text[10] field fails, and note the exact field name "Quality Grade" on both tables.

Learn More

• Table extension object — how to add fields to Item and Sales Line.
• Events in AL — publisher/subscriber model in one page.
• Subscribing to events — how to write a subscriber method step by step.
• EventSubscriber attribute — the attribute's arguments, including the Database:: syntax for table publishers.