Impossible to save a document when created with a template

[pronguen]

Describe the bug

The document form cannot be saved when it was opened with this specific template (it does not give any explanations to the end user, see screenshot): https://ils.test.rero.ch/professional/records/templates/detail/185

{"created":"2021-05-14T15:10:51.157549+00:00","id":"185","links":{"self":"https://ils.test.rero.ch/api/templates/185"},"metadata":{"$schema":"https://ils.rero.ch/schemas/templates/template-v0.0.1.json","creator":{"$ref":"https://ils.rero.ch/api/patrons/16"},"data":{"$schema":"https://ils.rero.ch/schemas/documents/document-v0.0.1.json","_masked":false,"adminMetadata":{"descriptionLanguage":"fre","encodingLevel":"Full level"},"contentMediaCarrier":[{"carrierType":"rdact:1049","contentType":["rdaco:1020"],"mediaType":"rdamt:1007"}],"contribution":[{"agent":{"date_of_birth":"19..-....","preferred_name":"Nom, pr\u00e9nom","type":"bf:Person"},"role":["aut"]}],"extent":"xxx pages","genreForm":[{"identifiedBy":{"type":"rero-rameau","value":"A021121540"},"source":"rero","term":"[Roman policier]","type":"bf:Topic"}],"identifiedBy":[{"type":"bf:Ean","value":"0000000000"}],"issuance":{"main_type":"rdami:1001","subtype":"materialUnit"},"language":[{"type":"bf:Language","value":"fre"}],"pid":"2019394","provisionActivity":[{"place":[{"country":"fr","type":"bf:Place"}],"startDate":2021,"statement":[{"label":[{"value":"[Lieu]"}],"type":"bf:Place"},{"label":[{"value":"nom de l'\u00e9diteur"}],"type":"bf:Agent"},{"label":[{"value":"[2021]"}],"type":"Date"}],"type":"bf:Publication"}],"responsibilityStatement":[[{"value":"mention de responsabilit\u00e9"}]],"seriesStatement":[{"seriesTitle":[{"value":"collection xxx"}]}],"title":[{"mainTitle":[{"value":"titre propre"}],"subtitle":[{"value":"sous-titre"}],"type":"bf:Title"}],"type":[{"main_type":"docmaintype_book","subtype":"docsubtype_other_book"}]},"name":"[CLT] mod\u00e8le formation livre roman policier","organisation":{"$ref":"https://ils.rero.ch/api/organisations/3"},"pid":"185","template_type":"documents","visibility":"public"},"updated":"2021-05-14T15:11:17.683668+00:00"}

With other templates, it works.

To Reproduce

1. Log in as reroilstest+imagination@gmail.com (organisation 3)
2. Use this template
3. Fill the fields and try to save (impossible)
4. Remove all fields except the required ones and try to save (impossible)

Expected behavior

• It is possible to save a document using this template.
• The form explains to the end user what the error is.

Context

• server: ils.test.rero.ch
• version: v1.2.0

Screenshots