EBS PO发运匹配审批层(INVOICE_MATCHING)

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　　研究了下订单发运行上的匹配审批层(INVOICE_MATCHING)，想找出对应后台表哪个字段。
　　一番追查，终于在pll中找出如下代码：
IF ((x_Receipt_Required_Flag = 'N' OR x_Receipt_Required_Flag IS NULL) AND
(x_Inspection_Required_Flag = 'N' OR
x_Inspection_Required_Flag IS NULL)) THEN
Copy('2WAY', 'po_shipments.invoice_matching');
ELSIF (x_Receipt_Required_Flag = 'Y' AND
(x_Inspection_Required_Flag = 'N' OR
x_Inspection_Required_Flag IS NULL)) THEN
Copy('3WAY', 'po_shipments.invoice_matching');
ELSIF (x_Receipt_Required_Flag = 'Y' AND
x_Inspection_Required_Flag = 'Y') THEN
Copy('4WAY', 'po_shipments.invoice_matching');
/* Bug 475621 ecso 4/22/97
* Handle other values; copy null
*/
ELSE
Copy('', 'po_shipments.invoice_matching');
END IF;　　如此得知：
　　plla(po_line_locations_all)中，receipt_required_flag(R)和inspection_required_flag(I)的值共同决定了该选项。
R:N 且 I:N =>2way
R:Y 且 I:N => 3way
R:Y 且  I:Y => 4way