addDisbursementScheduleItemDocuments

Mutation

Attach documents (invoices, contracts, award letters, purchase orders) to a disbursement so approvers reviewing it have the same materials the PO/PM used.

Files are uploaded to the file service first; this records the resulting ids. Ids are appended to any already on the item and deduped, so a concurrent upload is never clobbered.

Rejected once the payment has settled — paid, an equivalent WoW terminal status, or completed — at which point the document list is frozen for every role. A refused payment is not a lock state: it is remediated and re-requested.

Returns AddDisbursementScheduleItemDocumentsPayload !.