$this->post($this->serialize($thirdparty)) of type string is incompatible with the type integer expected by parameter $id of Dolibarr\Client\Domain\R...sourceId::__construct().
(
Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-type annotation
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return new ResourceId(/** @scrutinizer ignore-type */ $this->post($this->serialize($thirdparty)));