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Custom validation multi value paragraphs: highlighting missing field

I am using constraint for the validation my multi value paragraph field.

I can correctly implement the different validation rules but I haven’t found out how to highlight only the erroneous field(s).

Here is my violation declaration

      $this->context        ->buildViolation($constraint->modaliteRequise)        ->atPath((string) $delta . 'subform.field_modalite.0')        ->addViolation();

This highlights all fields of all paragraphs.

How can I only highlight the missing field in the affected paragraph?

Thanks Rainer

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Custom validation multi value paragraphs: highlighting missing field

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