diff --git a/api-v3/src/asset-master/simple-inventory-structure.service.ts b/api-v3/src/asset-master/simple-inventory-structure.service.ts
new file mode 100644
index 0000000..78604e1
--- /dev/null
+++ b/api-v3/src/asset-master/simple-inventory-structure.service.ts
@@ -0,0 +1,323 @@
+import { randomUUID } from 'node:crypto';
+import {
+  BadRequestException,
+  ConflictException,
+  Injectable,
+  NotFoundException,
+} from '@nestjs/common';
+import { DataSource, EntityManager } from 'typeorm';
+import { administrationAuditContext, isUniqueViolation } from '../administration/common/administration-audit';
+import { AuditService } from '../audit/audit.service';
+import type { AuthPrincipal, RequestWithContext } from '../common/http/request-context';
+import {
+  AssetDataOrigin,
+  AssetInformationStatus,
+  AssetOperationalStatus,
+  AssetVersionChangeType,
+  AuditAction,
+} from '../database/entities';
+import type { CreateInventoryStructureDto, InventoryStructureKind } from './dto/create-inventory-structure.dto';
+import { AssetHistoryService } from './asset-history.service';
+
+type StructureTypeRow = { id: string; code: string; name: string };
+type ParentRow = {
+  id: string;
+  code: string;
+  name: string;
+  typeCode: string;
+  inventoryFamilyId: string | null;
+  operationalAreaId: string | null;
+  operatorCompanyId: string | null;
+};
+type FamilyRow = {
+  id: string;
+  code: string;
+  name: string;
+  level: 'INSTALLATION' | 'SUBINSTALLATION';
+};
+
+const TYPE_CODE_BY_KIND: Record<Exclude<InventoryStructureKind, 'EMPRESA'>, string> = {
+  DEPARTAMENTO: 'departamento',
+  AREA: 'area',
+  YACIMIENTO: 'yacimiento',
+  INSTALACION: 'instalacion',
+  SUBINSTALACION: 'subinstalacion',
+};
+
+const PARENT_TYPE_BY_KIND: Record<InventoryStructureKind, string | null> = {
+  EMPRESA: null,
+  DEPARTAMENTO: null,
+  AREA: 'departamento',
+  YACIMIENTO: 'area',
+  INSTALACION: 'yacimiento',
+  SUBINSTALACION: 'instalacion',
+};
+
+@Injectable()
+export class SimpleInventoryStructureService {
+  constructor(
+    private readonly dataSource: DataSource,
+    private readonly audit: AuditService,
+    private readonly history: AssetHistoryService,
+  ) {}
+
+  async create(
+    dto: CreateInventoryStructureDto,
+    principal: AuthPrincipal,
+    request: RequestWithContext,
+  ) {
+    try {
+      return await this.dataSource.transaction(async (manager) => {
+        const type = await this.requireStructureType(manager, dto.kind);
+        const parent = await this.requireParent(manager, dto.kind, dto.parentId ?? null);
+        const family = await this.requireFamily(manager, dto.kind, dto.familyId ?? null, parent);
+
+        let operationalAreaId: string | null = null;
+        let operatorCompanyId: string | null = null;
+
+        if (dto.kind === 'YACIMIENTO') {
+          if (!parent) throw new BadRequestException({ code: 'INVENTORY_YACIMIENTO_AREA_REQUIRED', message: 'Seleccioná el Área del Yacimiento' });
+          if (!dto.operatorCompanyId) throw new BadRequestException({ code: 'INVENTORY_YACIMIENTO_COMPANY_REQUIRED', message: 'Seleccioná la Empresa operadora del Yacimiento' });
+          await this.requireAreaCompanyRelation(manager, parent.id, dto.operatorCompanyId);
+          operationalAreaId = parent.id;
+          operatorCompanyId = dto.operatorCompanyId;
+        } else if (dto.kind === 'INSTALACION' || dto.kind === 'SUBINSTALACION') {
+          operationalAreaId = parent?.operationalAreaId ?? null;
+          operatorCompanyId = parent?.operatorCompanyId ?? null;
+          if (!operationalAreaId || !operatorCompanyId) {
+            throw new ConflictException({
+              code: 'INVENTORY_YACIMIENTO_CONTEXT_MISSING',
+              message: 'El Yacimiento de origen debe tener Área y Empresa operadora válidas',
+            });
+          }
+        } else if (dto.operatorCompanyId || dto.concessionTypeId) {
+          throw new BadRequestException({
+            code: 'INVENTORY_SIMPLE_CONTEXT_NOT_ALLOWED',
+            message: 'Empresa operadora sólo corresponde al Yacimiento',
+          });
+        }
+
+        const generatedCode = dto.code?.trim().toUpperCase() || this.generatedCode(dto.kind, dto.name);
+        const rows = (await manager.query(`
+          INSERT INTO assets (
+            asset_type_id,parent_id,operational_area_id,operator_company_id,concession_type_id,inventory_family_id,
+            code,name,common_name,description,information_status,operational_status,
+            data_origin,source_name,source_reference,source_notes,created_by,updated_by,provenance_updated_by
+          ) VALUES (
+            $1::uuid,$2::uuid,$3::uuid,$4::uuid,NULL,$5::uuid,
+            $6::varchar,$7::varchar,NULL,NULL,$8::asset_information_status,$9::asset_operational_status,
+            $10::varchar,$11::varchar,$12::varchar,$13::text,$14::uuid,$14::uuid,$14::uuid
+          ) RETURNING id
+        `, [
+          type.id,
+          parent?.id ?? null,
+          operationalAreaId,
+          operatorCompanyId,
+          family?.id ?? null,
+          generatedCode,
+          dto.name,
+          AssetInformationStatus.DRAFT,
+          AssetOperationalStatus.UNKNOWN,
+          AssetDataOrigin.MANUAL,
+          dto.kind === 'EMPRESA' ? 'Maestro manual de Empresas' : 'Alta simple de Inventario',
+          `inventory-simple:${dto.kind.toLowerCase()}`,
+          family ? `Tipo: ${family.name}` : null,
+          principal.userId,
+        ])) as Array<{ id: string }>;
+        const id = rows[0]?.id;
+        if (!id) throw new Error('No se pudo crear el registro');
+
+        if (dto.kind === 'EMPRESA') {
+          await manager.query(`
+            INSERT INTO organization_profiles(asset_id,organization_kind,legal_name,updated_by)
+            VALUES ($1::uuid,'COMPANY',$2,$3::uuid)
+            ON CONFLICT (asset_id) DO UPDATE
+              SET legal_name=EXCLUDED.legal_name,updated_by=EXCLUDED.updated_by,updated_at=CURRENT_TIMESTAMP
+          `, [id, dto.name, principal.userId]);
+        }
+
+        const versionNumber = await this.history.capture(
+          manager,
+          id,
+          AssetVersionChangeType.CREATED,
+          principal,
+          request,
+        );
+
+        await manager.query(`
+          INSERT INTO asset_context_history (
+            asset_id,parent_id,operational_area_id,operator_company_id,valid_from,
+            change_reason,asset_version_number,source,request_id,created_by
+          ) VALUES ($1,$2,$3,$4,CURRENT_TIMESTAMP,$5,$6,'WEB',$7,$8)
+        `, [
+          id,
+          parent?.id ?? null,
+          operationalAreaId,
+          operatorCompanyId,
+          dto.kind === 'YACIMIENTO'
+            ? 'Alta de Yacimiento con Empresa operadora vinculada al Área'
+            : 'Alta simple de Inventario',
+          versionNumber,
+          request.requestId,
+          principal.userId,
+        ]);
+
+        const created = await this.loadView(manager, id);
+        await this.audit.record({
+          ...administrationAuditContext(principal, request),
+          action: AuditAction.ASSET_CREATED,
+          entityType: 'asset',
+          entityId: id,
+          afterData: created as Record<string, unknown>,
+          metadata: {
+            versionNumber,
+            inventoryStructureKind: dto.kind,
+            inventoryFamilyId: family?.id ?? null,
+            inventoryFamilyCode: family?.code ?? null,
+            operatorCompanyId,
+            simpleInventoryFlow: true,
+          },
+        }, manager);
+        return created;
+      });
+    } catch (error) {
+      if (isUniqueViolation(error)) {
+        throw new ConflictException({ code: 'ASSET_CODE_ALREADY_EXISTS', message: 'Ya existe un registro con ese código' });
+      }
+      throw error;
+    }
+  }
+
+  private async requireStructureType(manager: EntityManager, kind: InventoryStructureKind): Promise<StructureTypeRow> {
+    const sql = kind === 'EMPRESA'
+      ? `SELECT id,code,name FROM asset_types WHERE operational_role='COMPANY' AND is_active=true ORDER BY (lower(code)='empresa') DESC,created_at LIMIT 1`
+      : `SELECT id,code,name FROM asset_types WHERE lower(code)=lower($1::text) AND is_active=true LIMIT 1`;
+    const params = kind === 'EMPRESA' ? [] : [TYPE_CODE_BY_KIND[kind as Exclude<InventoryStructureKind, 'EMPRESA'>]];
+    const rows = (await manager.query(sql, params)) as StructureTypeRow[];
+    if (!rows[0]) throw new ConflictException({ code: 'INVENTORY_STRUCTURE_TYPE_NOT_CONFIGURED', message: `El nivel ${kind} no está configurado` });
+    return rows[0];
+  }
+
+  private async requireParent(
+    manager: EntityManager,
+    kind: InventoryStructureKind,
+    parentId: string | null,
+  ): Promise<ParentRow | null> {
+    const expectedType = PARENT_TYPE_BY_KIND[kind];
+    if (!expectedType) {
+      if (parentId) throw new BadRequestException({ code: 'INVENTORY_ROOT_MUST_NOT_HAVE_PARENT', message: `${kind === 'EMPRESA' ? 'Empresa' : 'Departamento'} no admite padre` });
+      return null;
+    }
+    if (!parentId) throw new BadRequestException({ code: 'INVENTORY_PARENT_REQUIRED', message: `Seleccioná el nivel superior para crear ${kind.toLowerCase()}` });
+
+    const rows = (await manager.query(`
+      SELECT asset.id,asset.code,asset.name,lower(type.code) AS "typeCode",
+        asset.inventory_family_id AS "inventoryFamilyId",
+        CASE WHEN lower(type.code)='area' THEN asset.id ELSE asset.operational_area_id END AS "operationalAreaId",
+        asset.operator_company_id AS "operatorCompanyId"
+      FROM assets asset
+      JOIN asset_types type ON type.id=asset.asset_type_id
+      WHERE asset.id=$1::uuid AND asset.information_status<>'INACTIVE'
+      FOR KEY SHARE OF asset
+    `, [parentId])) as ParentRow[];
+    const parent = rows[0];
+    if (!parent || parent.typeCode !== expectedType) {
+      throw new BadRequestException({ code: 'INVENTORY_PARENT_INVALID', message: `El registro padre debe ser ${expectedType}` });
+    }
+    return parent;
+  }
+
+  private async requireAreaCompanyRelation(manager: EntityManager, areaId: string, companyId: string): Promise<void> {
+    const rows = await manager.query(`
+      SELECT 1
+      FROM area_company_relations relation
+      JOIN assets company ON company.id=relation.company_id
+      JOIN asset_types company_type ON company_type.id=company.asset_type_id
+      WHERE relation.area_id=$1::uuid
+        AND relation.company_id=$2::uuid
+        AND relation.relation_role='OPERATOR'
+        AND relation.valid_until IS NULL
+        AND company.information_status<>'INACTIVE'
+        AND company_type.operational_role='COMPANY'
+        AND company_type.is_active=true
+      LIMIT 1
+      FOR KEY SHARE OF relation
+    `, [areaId, companyId]);
+    if (!rows[0]) {
+      throw new BadRequestException({
+        code: 'INVENTORY_YACIMIENTO_COMPANY_NOT_IN_AREA',
+        message: 'La Empresa seleccionada no está vinculada como explotadora del Área',
+      });
+    }
+  }
+
+  private async requireFamily(
+    manager: EntityManager,
+    kind: InventoryStructureKind,
+    familyId: string | null,
+    parent: ParentRow | null,
+  ): Promise<FamilyRow | null> {
+    if (kind !== 'INSTALACION' && kind !== 'SUBINSTALACION') {
+      if (familyId) throw new BadRequestException({ code: 'INVENTORY_FAMILY_NOT_ALLOWED', message: 'Este nivel no usa Tipo de Instalación/Subinstalación' });
+      return null;
+    }
+    if (!familyId) throw new BadRequestException({ code: 'INVENTORY_FAMILY_REQUIRED', message: `Seleccioná el tipo de ${kind === 'INSTALACION' ? 'Instalación' : 'Subinstalación'}` });
+
+    const rows = (await manager.query(`
+      SELECT id,code,name,level::text AS level
+      FROM inventory_families
+      WHERE id=$1::uuid AND is_active=true
+      LIMIT 1
+      FOR KEY SHARE
+    `, [familyId])) as FamilyRow[];
+    const family = rows[0];
+    if (!family) throw new NotFoundException({ code: 'INVENTORY_FAMILY_NOT_FOUND', message: 'El tipo seleccionado no existe o está oculto' });
+    const expected = kind === 'INSTALACION' ? 'INSTALLATION' : 'SUBINSTALLATION';
+    if (family.level !== expected) throw new BadRequestException({ code: 'INVENTORY_FAMILY_LEVEL_INVALID', message: 'El tipo seleccionado no corresponde a este nivel' });
+
+    if (kind === 'SUBINSTALACION') {
+      if (!parent?.inventoryFamilyId) throw new BadRequestException({ code: 'INVENTORY_PARENT_FAMILY_REQUIRED', message: 'La Instalación debe tener un tipo configurado' });
+      const compatible = await manager.query(`
+        SELECT 1 FROM inventory_family_parent_rules
+        WHERE child_family_id=$1::uuid AND parent_family_id=$2::uuid
+        LIMIT 1
+      `, [family.id, parent.inventoryFamilyId]);
+      if (!compatible[0]) throw new BadRequestException({ code: 'INVENTORY_SUBINSTALLATION_FAMILY_PARENT_INVALID', message: 'Ese tipo de Subinstalación no está habilitado dentro de la Instalación seleccionada' });
+    }
+    return family;
+  }
+
+  private generatedCode(kind: InventoryStructureKind, name: string): string {
+    const prefix = kind === 'EMPRESA' ? 'EMP'
+      : kind === 'DEPARTAMENTO' ? 'DEP'
+        : kind === 'AREA' ? 'AREA'
+          : kind === 'YACIMIENTO' ? 'YAC'
+            : kind === 'INSTALACION' ? 'INST'
+              : 'SUB';
+    const readable = name.normalize('NFD').replace(/[\u0300-\u036f]/g, '').toUpperCase()
+      .replace(/[^A-Z0-9]+/g, '-').replace(/^-+|-+$/g, '').slice(0, 48) || 'REGISTRO';
+    return `${prefix}-${readable}-${randomUUID().slice(0, 8).toUpperCase()}`.slice(0, 120);
+  }
+
+  private async loadView(manager: EntityManager, id: string) {
+    const rows = await manager.query(`
+      SELECT asset.id,asset.code,asset.name,asset.common_name AS "commonName",asset.description,
+        asset.information_status AS "informationStatus",asset.operational_status AS "operationalStatus",
+        JSONB_BUILD_OBJECT('id',type.id,'code',type.code,'name',type.name) AS type,
+        CASE WHEN parent.id IS NULL THEN NULL ELSE JSONB_BUILD_OBJECT('id',parent.id,'code',parent.code,'name',parent.name) END AS parent,
+        CASE WHEN area.id IS NULL THEN NULL ELSE JSONB_BUILD_OBJECT('id',area.id,'code',area.code,'name',area.name) END AS "operationalArea",
+        CASE WHEN company.id IS NULL THEN NULL ELSE JSONB_BUILD_OBJECT('id',company.id,'code',company.code,'name',COALESCE(profile.legal_name,company.name)) END AS "operatorCompany",
+        CASE WHEN family.id IS NULL THEN NULL ELSE JSONB_BUILD_OBJECT('id',family.id,'code',family.code,'name',family.name,'level',family.level) END AS "inventoryFamily",
+        asset.created_at AS "createdAt",asset.updated_at AS "updatedAt"
+      FROM assets asset
+      JOIN asset_types type ON type.id=asset.asset_type_id
+      LEFT JOIN assets parent ON parent.id=asset.parent_id
+      LEFT JOIN assets area ON area.id=asset.operational_area_id
+      LEFT JOIN assets company ON company.id=asset.operator_company_id
+      LEFT JOIN organization_profiles profile ON profile.asset_id=company.id
+      LEFT JOIN inventory_families family ON family.id=asset.inventory_family_id
+      WHERE asset.id=$1::uuid
+    `, [id]);
+    return rows[0];
+  }
+}