Linked parameters use the dynamic format of the mobile business object to drive the content of the drop-down values on the device application.
Many applications have drop-down lists of values you can choose, and the values you select can affect the choices in other lists.
Linked parameters make it easier to build entry forms for device applications that allow dependent drop-down choices. For example, if a user selects "California" for the state field, the country field is automatically set to "USA." This makes the input data consistent, with less chance of errors. For example:
| Field name | Values |
|---|---|
| Field 1 | Accepts values A, B, or C |
| Field 2 | Allows values dependent on Field 1: A–>1,2,3 B–>4, 5, 6 C–>7, 8, 9 |
| Field 3 | Allows values dependent on Field 1:A–>100, 101, 102 B–>200, 201, 202 C–>300, 301, 302 |
| Field 4 | Allows values dependent on Field 2: 1–>11,111 2->22,222 3–>33,333 4–>44,444 5->55,555 6–>66,666 7–>77,777 8–>88,888 9–>99,999 |
When the user selects value "A" in Field 1, the allowed values listed in Field 2 change to 1, 2, 3; the Field 3 choices become 100, 101, 102.
If the user chooses value C in Field 1, the Field 2 choices become 7, 8, 9; Field 3 choices become 300, 301, 302; Field 4 choices become 77,777, 88,888, 99,999.