The amount is due from UNDP mainly because, not having a separate treasury function, UNOPS relies on UNDP central services for the custody of its funds and disbursement of its payments.
开发计划署之所以欠款，主要是因为项目厅没有一个独立的财务职能单位，而是依靠开发计划署中央事务处保管其资金和支付款项。