Credit and Debt plus reason attribute inide register

apps/edr-freight-api/src/modules/billing/entities/invoice.entity.ts

@@ -180,4 +180,27 @@ export class Invoice extends BaseEntity {
 
   @Column({ name: "eims_cancellation_remark", type: "text", nullable: true })
   eimsCancellationRemark?: string | null;
+
+  /**
+   * `DocumentDetails.Type` to file this invoice as — "INV" (default), "DEB" or "CRE". Confirmed
+   * by MoR support directly (not the collection): debit/credit notes go through this same
+   * `/v1/register` endpoint, distinguished only by `Type` + `Reason`, linked via
+   * `ReferenceDetails.RelatedDocument` to the original invoice's IRN. This module does not create
+   * debit/credit note invoices — that is a freight-workflow decision — it only files one
+   * correctly once these columns are set on an existing row.
+   */
+  @Column({ name: "eims_document_type", type: "varchar", length: 8, default: "INV" })
+  eimsDocumentType!: string;
+
+  /** Required by MoR when `eimsDocumentType` is DEB/CRE — why the note was issued. */
+  @Column({ name: "eims_reason", type: "text", nullable: true })
+  eimsReason?: string | null;
+
+  /** The original registered invoice this debit/credit note adjusts. Required for DEB/CRE. */
+  @Column({ name: "related_invoice_id", type: "uuid", nullable: true })
+  relatedInvoiceId?: string | null;
+
+  @ManyToOne(() => Invoice)
+  @JoinColumn({ name: "related_invoice_id" })
+  relatedInvoice?: Invoice | null;
 }