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clarify @mandatory is not validated in deep updates #2585

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clarify @mandatory is not validated in deep updates #2585

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clarify @mandatory is not validated in deep updates, fix wrong info r…
mariayord May 20, 2026
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removed section, as it is mentioned already in Field Control below
mariayord May 20, 2026
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10 changes: 3 additions & 7 deletions guides/services/constraints.md
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Expand Up @@ -368,13 +368,9 @@ service Sue {
}
```

In addition to server-side input validation as introduced above, this adds a corresponding `@FieldControl` annotation to the EDMX so that OData / Fiori clients would enforce a valid entry, thereby avoiding unnecessary request roundtrips:

```xml
<Annotations Target="Sue.Books/title">
<Annotation Term="Common.FieldControl" EnumMember="Common.FieldControlType/Mandatory"/>
</Annotations>
```
::: warning Deep updates not covered
`@mandatory` validation is **not** applied to nested data in deep update operations. To enforce mandatory values in those cases, use the [`not null` constraint](../../cds/cdl#constraints) instead.
:::
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@renejeglinsky renejeglinsky May 21, 2026

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:::
:::
[Learn more about `@Fieldcontrol` annotation with `@mandatory`.](#mandatory-1){.learn-more}


<div id="mandatorywithexpressions"/>

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