ERP Stock Service (stock/ErpStockServiceImpl.java)

Implements inventory CRUD, pagination and stock count validation for ERP products, ensuring non‑negative stock levels; used wherever product stock data is accessed or updated.

// Source: https://github.com/YunaiV/ruoyi-vue-pro | License: MIT | Copyright 2021 ruoyi-vue-pro
// Provided via justclaw.it.com; keep this notice with the code.
package cn.iocoder.yudao.module.erp.service.stock;

import cn.iocoder.yudao.framework.common.pojo.PageResult;
import cn.iocoder.yudao.module.erp.controller.admin.stock.vo.stock.ErpStockPageReqVO;
import cn.iocoder.yudao.module.erp.dal.dataobject.stock.ErpStockDO;
import cn.iocoder.yudao.module.erp.dal.mysql.stock.ErpStockMapper;
import cn.iocoder.yudao.module.erp.service.product.ErpProductService;
import org.springframework.stereotype.Service;
import org.springframework.validation.annotation.Validated;

import javax.annotation.Resource;
import java.math.BigDecimal;

import static cn.iocoder.yudao.framework.common.exception.util.Se

... (truncated -- full source via MCP)