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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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73b96c8
clarify @mandatory is not validated in deep updates, fix wrong info r…
mariayord May 20, 2026
8b50ac5
removed section, as it is mentioned already in Field Control below
mariayord May 20, 2026
fa73d2d
Update guides/services/constraints.md
mariayord Jun 9, 2026
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10 changes: 4 additions & 6 deletions guides/services/constraints.md
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Expand Up @@ -368,13 +368,11 @@ 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:
::: 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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```xml
<Annotations Target="Sue.Books/title">
<Annotation Term="Common.FieldControl" EnumMember="Common.FieldControlType/Mandatory"/>
</Annotations>
```
[Learn more about `@Fieldcontrol` annotation with `@mandatory`.](#mandatory-1){.learn-more}

<div id="mandatorywithexpressions"/>

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