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docs(config): validation rules on MPE_DERIVED

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dc committed 2026-10-20 09:01:58 +00:00
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@@ -80,6 +80,8 @@ A configuration error - a bad name, an invalid type or length, a name collision,
Most of these rules are also applied when a row is submitted for approval, through a post edit hook on `MPE_DERIVED`. A bad name, type, length, format or expression - or a duplicate name, or a reference to a variable that is not defined earlier - is rejected at submit time, while the error can still be corrected, rather than breaking the EDIT screen afterwards. The collision between `VAR_NM` and a physical column of the target table is only checked at read time, as the hook does not have the target library assigned. Most of these rules are also applied when a row is submitted for approval, through a post edit hook on `MPE_DERIVED`. A bad name, type, length, format or expression - or a duplicate name, or a reference to a variable that is not defined earlier - is rejected at submit time, while the error can still be corrected, rather than breaking the EDIT screen afterwards. The collision between `VAR_NM` and a physical column of the target table is only checked at read time, as the hook does not have the target library assigned.
The simple rules are also configured as validation rules on the table itself, so they show up in the grid before submission: `VAR_TYPE` is a dropdown of `C` and `N`, `VAR_ORDER` and `VAR_LEN` carry minimum and maximum values, and `VAR_NM`, `VAR_FMT` and `VAR_LOGIC` are pattern checked. Validation rules are evaluated in the browser, so the post edit hook remains the authoritative check.
!!! warning "Derived values can expose hidden data" !!! warning "Derived values can expose hidden data"
An expression can reference a column that is hidden from the user by [Column Level Security](/column-level-security/), and the derived column will show the result. Configure derived variables with the same care as any other data exposure. An expression can reference a column that is hidden from the user by [Column Level Security](/column-level-security/), and the derived column will show the result. Configure derived variables with the same care as any other data exposure.