Error message not returned to CLO when Open Zaak returns error message in for each pipe with parallel="false"

[jacodg]

For example with ForEachChildElementPipe PostStatusIterator in https://github.com/ibissource/zaakbrug/blob/master/src/main/configurations/Translate/Configuration_SetResultaatAndStatus.xml we have seen sender PostZgwStatus return:

{"type":"https://xxx/ref/fouten/ValidationError/","code":"invalid","title":"Invalid input.","status":400,"detail":"","instance":"urn:uuid:xxx","invalidParams":[{"name":"nonFieldErrors","code":"archiefactiedatum-error","reason":"Geen besluiten aan zaak gekoppeld om brondatum uit af te leiden."}]}

With parallel="true" this doesn't throw an exception and at the end a SOAP message is returned: that doesn't contain an error message