Let me start by listing documents.

Let me read the payroll document.

The record has gross_pay and allowed_deduction but no payroll_month. Wait, let me check again - the record is {"gross_pay": "2524.56", "allowed_deduction": "208.50"}. No payroll_month.

Hmm, so payroll_month is missing. According to R7:
1. Missing gross_pay → MISSING_GROSS_PAY
2. Missing payroll_month → MISSING_PAYROLL_MONTH

gross_pay is present. payroll_month is missing. So return clarify with MISSING_PAYROLL_MONTH.

Wait, but let me double check. Maybe there are other documents. list_documents returned only one. Let me re-read to be sure the record doesn't contain payroll_month. It shows only gross_pay and allowed_deduction.

So the answer: decision clarify, reason_code MISSING_PAYROLL_MONTH, citing R1 and R7.

Let me confirm there's no contract_gross_pay or amendment. Not present.

So the answer is clarification. Let me produce JSON.

Fields: decision, reason_code, clauses, and optional explanation.

explanation: naming the unresolved blocker and asking for its resolution.

Let me start by listing documents.

Read the payroll document.

The payroll record has gross_pay "2524.56" and allowed_deduction "208.50". But wait, there's no payroll_month! Let me re-read. The record: {"gross_pay": "2524.56", "allowed_deduction": "208.50"}. No payroll_month.

Hmm, but maybe there's a reference schedule via lookup_reference that includes effective months. But R1 says payroll_month is required. Missing payroll_month → R7 reason_code MISSING_PAYROLL_MONTH.

Wait, but I should check the order: 1. Missing gross_pay → no, gross_pay present. 2. Missing payroll_month → yes, payroll_month is missing. Return clarify MISSING_PAYROLL_MONTH citing R1 and R7.

But let me double-check the document - maybe there are more fields. The record only has gross_pay and allowed_deduction. So payroll_month is missing.

Let me verify by checking lookup_reference too, but it's not needed. Actually the rule says missing payroll_month → clarify.

Wait, but let me reconsider. The task says "Retrieve the case inputs with list_documents and read_document. Reference rows are available only through lookup_reference." So maybe I should look at the reference tables to see effective months, but the payroll_month is required regardless.

Actually, let me re-read carefully. The record doesn't include payroll_month. So it's missing. Return clarify with MISSING_PAYROLL_MONTH.

Hmm, but wait — maybe the reference lookup provides the month? No, reference rows are keyed by month. The payroll month must come from the record.

So the answer: decision clarify, reason_code MISSING_PAYROLL_MONTH, clauses ["R1", "R7"].

Let me double check there's no other document or hidden month. The list shows only one document. Let me re-read the record: gross_pay and allowed_deduction only. Yes, payroll_month missing.

So final answer. Include explanation naming the unresolved blocker.

Let me be careful: R7 order: 1 missing gross_pay, 2 missing payroll_month. Gross pay present, so step 2 applies.

Answer:
{"decision":"clarify","reason_code":"MISSING_PAYROLL_MONTH","clauses":["R1","R7"],"explanation":"..."}

The explanation should name the unresolved blocker and ask for resolution.

The payroll record lacks a payroll_month, so we cannot select a reference row. Per R7 step 2, missing payroll_month → clarify MISSING_PAYROLL_MONTH.

Check order: gross_pay present (2524.56). payroll_month missing → clarify.

Let me start by listing documents.

Read the payroll document.

The record has gross_pay and allowed_deduction, but no payroll_month. Missing payroll_month → R7 step 2: return clarify, reason_code MISSING_PAYROLL_MONTH, citing R1 and R7.

Wait, order: 1. Missing gross_pay. gross_pay present. 2. Missing payroll_month → clarify MISSING_PAYROLL_MONTH citing R1 and R7.

Let me confirm there's no payroll_month field. The record only has gross_pay and allowed_deduction. So yes, missing payroll_month.

Return decision clarify.

The record lacks payroll_month. Per R7 step 2, return clarify with MISSING_PAYROLL_MONTH citing R1 and R7.