Update README.md

README.md

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 -  [采购单据信息处理规则](http://lab.hbbyun.com/businessdoc/hbbdoc/wikis/%E9%87%87%E8%B4%AD%E5%8D%95%E6%8D%AE%E4%BF%A1%E6%81%AF%E5%A4%84%E7%90%86%E8%A7%84%E5%88%99)
 -  [外采订单处理规则](http://lab.hbbyun.com/businessdoc/hbbdoc/wikis/%E5%A4%96%E9%87%87%E8%AE%A2%E5%8D%95%E5%A4%84%E7%90%86%E8%A7%84%E5%88%99)
 -  [收款、付款单处理规则](http://lab.hbbyun.com/businessdoc/hbbdoc/wikis/%E6%94%B6%E6%AC%BE%E3%80%81%E4%BB%98%E6%AC%BE%E5%8D%95%E5%A4%84%E7%90%86%E8%A7%84%E5%88%99)
+-  [收款、付款单输入金额限制（含退款）](http://lab.hbbyun.com/businessdoc/hbbdoc/wikis/%E6%94%B6%E6%AC%BE%E3%80%81%E4%BB%98%E6%AC%BE%E5%8D%95%E8%BE%93%E5%85%A5%E9%87%91%E9%A2%9D%E9%99%90%E5%88%B6%EF%BC%88%E5%90%AB%E9%80%80%E6%AC%BE%EF%BC%89)
 -  [销售、出货、采购、进货前款计算公式](http://lab.hbbyun.com/businessdoc/hbbdoc/wikis/%E9%94%80%E5%94%AE%E3%80%81%E5%87%BA%E8%B4%A7%E3%80%81%E9%87%87%E8%B4%AD%E3%80%81%E8%BF%9B%E8%B4%A7%E6%AC%A0%E6%AC%BE%E8%AE%A1%E7%AE%97%E5%85%AC%E5%BC%8F)
 -  [自动核销算法](http://lab.hbbyun.com/businessdoc/hbbdoc/wikis/%E8%87%AA%E5%8A%A8%E6%A0%B8%E9%94%80%E7%AE%97%E6%B3%95)
 - [批发业务消息通知谁](http://lab.hbbyun.com/businessdoc/hbbdoc/wikis/%E4%B8%9A%E5%8A%A1%E6%B6%88%E6%81%AF%E9%80%9A%E7%9F%A5%E8%B0%81)