{"$schema":"https://json-schema.org/draft/2020-12/schema","title":"Portable Document A1 — Request (Reg. 883/2004)","description":"Request addressed to the competent social-security institution of the sending Member State for issuance of Portable Document A1 under Article 19(2) of Reg. (EC) 987/2009, certifying the legislation applicable to a posted worker per Articles 12 or 13 of Reg. (EC) 883/2004 (as amended by Dir. (EU) 2018/957 on posted workers).","type":"object","required":["request_date","sending_institution","sending_employer","host_employer","worker","posting","legal_basis","signatory"],"additionalProperties":false,"properties":{"request_date":{"type":"string","format":"date","description":"Date on which the request is submitted to the competent institution."},"request_reference":{"type":"string","description":"Applicant's internal reference for this request."},"a1_document_number":{"type":"string","description":"Optional — PD A1 form number, when already issued by the institution in response to this request."},"sending_institution":{"type":"object","description":"Competent social-security institution of the sending Member State (Art. 1(q) Reg. 883/2004).","required":["name","member_state","address"],"additionalProperties":false,"properties":{"name":{"type":"string","minLength":1},"member_state":{"type":"string","description":"ISO 3166-1 alpha-2 code of the sending Member State.","pattern":"^[A-Z]{2}$"},"address":{"type":"string"},"contact_email":{"type":"string","format":"email"},"reference":{"type":"string","description":"File reference assigned by the institution, if known."}}},"sending_employer":{"type":"object","description":"Habitual employer established in the sending Member State where the worker normally carries out substantial activities (Art. 14(2) Reg. 987/2009).","required":["name","address","member_state","identifier"],"additionalProperties":false,"properties":{"name":{"type":"string","minLength":1},"legal_form":{"type":"string"},"address":{"type":"string"},"member_state":{"type":"string","pattern":"^[A-Z]{2}$"},"identifier":{"type":"string","description":"National company / VAT / employer identifier."},"social_security_number":{"type":"string","description":"Employer registration number with the sending social-security institution."},"contact_person":{"type":"string"},"contact_email":{"type":"string","format":"email"},"contact_phone":{"type":"string"}}},"host_employer":{"type":"object","description":"Undertaking or entity to which the worker is posted in the host Member State (Art. 12(1) Reg. 883/2004).","required":["name","address","member_state"],"additionalProperties":false,"properties":{"name":{"type":"string","minLength":1},"address":{"type":"string"},"member_state":{"type":"string","pattern":"^[A-Z]{2}$"},"identifier":{"type":"string","description":"Host entity national / VAT identifier, where available."},"contact_person":{"type":"string"},"contact_email":{"type":"string","format":"email"},"relationship":{"type":"string","enum":["client","group_company","service_recipient","own_establishment"],"description":"Nature of the link between sending employer and host."}}},"worker":{"type":"object","description":"Posted worker subject to the sending Member State's legislation under Art. 12 or 13 Reg. 883/2004.","required":["family_name","given_name","date_of_birth","nationality","personal_identifier","address"],"additionalProperties":false,"properties":{"family_name":{"type":"string","minLength":1},"given_name":{"type":"string","minLength":1},"date_of_birth":{"type":"string","format":"date"},"place_of_birth":{"type":"string"},"nationality":{"type":"string","description":"ISO 3166-1 alpha-2 nationality code.","pattern":"^[A-Z]{2}$"},"personal_identifier":{"type":"string","description":"National social-security / national registry number in the sending Member State."},"address":{"type":"string"},"member_state_residence":{"type":"string","description":"ISO 3166-1 alpha-2 code of the worker's Member State of residence (Art. 1(j) Reg. 883/2004).","pattern":"^[A-Z]{2}$"},"employment_start_date":{"type":"string","format":"date","description":"Start of the worker's employment with the sending employer."},"affiliated_since":{"type":"string","format":"date","description":"Date of affiliation to the sending Member State's social-security scheme."}}},"posting":{"type":"object","description":"Posting details — Art. 12(1) Reg. 883/2004 limits duration to 24 months.","required":["start_date","end_date","host_member_state","activity","work_location"],"additionalProperties":false,"properties":{"start_date":{"type":"string","format":"date"},"end_date":{"type":"string","format":"date"},"host_member_state":{"type":"string","pattern":"^[A-Z]{2}$"},"work_location":{"type":"string","description":"Address or site where the work is performed."},"activity":{"type":"string","description":"Description of the activity to be performed (Art. 12(1) Reg. 883/2004)."},"replaces_prior_posted_worker":{"type":"boolean","default":false,"description":"Whether the posting replaces another posted worker (prohibited under Art. 12(1) Reg. 883/2004)."},"remuneration_continues":{"type":"boolean","default":true,"description":"Confirmation that remuneration remains paid by the sending employer for the duration of the posting."},"direct_relationship_maintained":{"type":"boolean","default":true,"description":"Confirmation that the employment relationship with the sending employer is maintained throughout (Art. 14(1) Reg. 987/2009)."}}},"multi_state_activity":{"type":"object","description":"Only when legal_basis = art_13_* (activity in two or more Member States, Art. 13 Reg. 883/2004).","additionalProperties":false,"properties":{"member_states":{"type":"array","items":{"type":"string","pattern":"^[A-Z]{2}$"},"minItems":2,"description":"Member States in which the worker normally pursues activity."},"substantial_activity_share":{"type":"string","description":"Share of working time or remuneration performed in the Member State of residence (Art. 14(8) Reg. 987/2009 — threshold 25%)."}}},"legal_basis":{"type":"string","enum":["art_12_1","art_12_2","art_13_1","art_13_2","art_16_exception"],"description":"Basis for applicable-legislation certification: Art. 12(1) employed posting (≤24 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